Grammar Terms Glossary: 200+ Definitions for Students

Every language runs on grammar: the quiet scaffolding of rules and conventions that decides how words snap together into meaning. If you are studying for an exam, drafting a novel, teaching English to newcomers, or just trying to remember the difference between a gerund and a participle, this grammar terms glossary gives you plainspoken definitions for the vocabulary that matters. The entries are grouped by theme — parts of speech, sentence anatomy, verb forms, punctuation, and more — so you can treat it either as a read-through or as a quick-reference companion to English grammar.

The Eight Word Classes (Plus a Few Extras)

The parts of speech sort every word in English according to the job it does in a sentence. Most traditional lists name eight; a few modern grammars add a ninth or tenth.

Noun

A word naming a person, place, object, idea, or quality. Nouns split into common (river, teacher) versus proper (the Thames, Ms. Patel), concrete (keyboard) versus abstract (loyalty), and countable (apple/apples) versus uncountable (milk, advice).

Verb

A word that states an action (jump, type), an event (arrive, become), or a state (seem, remain). Every grammatical sentence in English has at least one verb.

Adjective

A word that gives more information about a noun or pronoun — size, color, shape, quantity, mood, or quality. In "a rusty bicycle," the adjective is rusty.

Adverb

A word that modifies a verb, an adjective, or another adverb, usually answering how, when, where, how often, or to what degree. In "He laughed loudly," loudly is the adverb.

Pronoun

A stand-in for a noun, used to keep prose from becoming repetitive — I, you, she, we, they, who, which, this, that.

Preposition

A small word that anchors a noun or pronoun to another piece of the sentence, often signaling place, time, direction, or relationship — under, before, during, beyond, through, against.

Conjunction

A connector word. Coordinating conjunctions link equals (and, but, or, nor, for, yet, so); subordinating conjunctions tie a dependent clause to a main one (because, unless, while, since).

Interjection

A short burst of feeling that stands outside the main sentence structure — oh, ouch, ugh, wow, yikes.

Article

A word placed in front of a noun to mark definiteness. English uses one definite article ("the") and two indefinite articles ("a" and "an").

Determiner

An umbrella category that includes articles along with demonstratives (this, those), possessives (my, her), and quantifiers (several, each, few). Determiners sit before nouns and narrow down their reference.

Building Blocks of a Sentence

Sentence

A string of words that delivers a complete thought. At minimum it needs a subject and a predicate.

Subject

The noun, pronoun, or noun phrase that the sentence is about — the thing doing the action or being described. In "My neighbor plays the cello," my neighbor is the subject.

Predicate

Everything said about the subject, including the verb and whatever goes with it (objects, complements, modifiers).

Object

A noun or pronoun on the receiving end of the verb. A direct object takes the action head-on ("She baked a cake"); an indirect object is the beneficiary or recipient ("She baked him a cake").

Complement

A word or phrase that finishes the meaning of a subject, object, or verb. In "The soup tastes salty," salty completes the linking verb.

Simple Sentence

One independent clause, standing on its own. "The dog barked."

Compound Sentence

Two or more independent clauses joined by a coordinating conjunction or a semicolon. "It was late, but we kept walking."

Complex Sentence

One independent clause plus at least one dependent clause. "Because the bus was late, she took a taxi."

Compound-Complex Sentence

A sentence with two or more independent clauses plus at least one dependent clause.

Declarative Sentence

A sentence that states a fact or opinion. "Saturn has many moons."

Interrogative Sentence

A sentence that asks something. "Where did you park?"

Imperative Sentence

A sentence issuing a directive, request, or instruction. "Pass the salt, please."

Exclamatory Sentence

A sentence that conveys strong feeling. "What a terrible storm!"

Verbs: Tense, Mood, and Form

Tense

The verb form that locates an action or state in time — past, present, or future.

Present Simple

Used for habits, routines, general truths, and things that are permanently the case. "Water freezes at zero degrees."

Present Continuous (Progressive)

Marks an action happening right now or around the present moment. "I am reading your email."

Past Simple

Reports a finished action or state in the past. "They arrived at noon."

Present Perfect

Links a past action to the present, either because it happened at an unspecified earlier time or because it still matters now. "We have visited Kyoto twice."

Past Perfect

Shows that one past event finished before another past event began. "By the time the film started, she had eaten all the popcorn."

Future Simple

Predicts or promises an action yet to happen. "I will call you tomorrow."

Infinitive

The unconjugated base form of a verb, usually introduced by "to" — to travel, to imagine, to be.

Gerund

The "-ing" form of a verb used as a noun. "Cooking relaxes her."

Participle

A verb form pressed into service as an adjective or as part of a compound tense. The present participle ends in "-ing" (singing, flying); the past participle usually ends in "-ed," "-en," or an irregular form (painted, chosen, brought).

Active Voice

Sentence structure in which the subject performs the verb's action. "The architect designed the museum."

Passive Voice

Sentence structure in which the subject receives the action. "The museum was designed by the architect." Built from a form of "be" plus a past participle.

Subjunctive Mood

A special verb form used for wishes, hypotheticals, recommendations, and demands. "If I were the coach, I'd start her." "The judge insists that the defendant appear in person."

Modal Verb

An auxiliary that adds shades of ability, permission, likelihood, or obligation — can, could, may, might, must, shall, should, will, would.

Transitive / Intransitive Verb

A transitive verb takes a direct object ("She painted the wall"). An intransitive verb does not ("He laughed").

Words That Stand In for Nouns

Collective Noun

A single noun that refers to a group — jury, staff, herd, orchestra.

Possessive

A form that signals ownership or belonging. Nouns take an apostrophe plus "s" (Rosa's notebook); pronouns have dedicated possessive forms (my, your, his, her, its, our, their).

Antecedent

The noun a pronoun refers back to. In "When Marcus arrived, he was soaked," Marcus is the antecedent of he.

Relative Pronoun

A pronoun that opens a relative clause — who, whom, whose, which, that.

Reflexive Pronoun

A pronoun that points back to the subject of the sentence — myself, yourself, himself, herself, itself, ourselves, themselves.

Case

The form of a noun or pronoun that signals its grammatical role: subjective (I, she, they), objective (me, her, them), and possessive (my, her, their).

Describing and Modifying

Comparative

The form of an adjective or adverb used to compare exactly two items — quicker, more reliable, later.

Superlative

The form that marks the top (or bottom) of a group of three or more — quickest, most reliable, latest.

Predicate Adjective

An adjective that follows a linking verb and describes the subject. "The coffee is bitter."

Attributive Adjective

An adjective sitting right before the noun it describes. "A bitter coffee."

Adverbial

Any word, phrase, or clause doing the work of an adverb by modifying a verb, adjective, or another adverb.

Groups of Words at Work

Clause

A cluster of words containing both a subject and a verb. An independent clause can stand on its own as a sentence; a dependent (subordinate) clause needs to attach to an independent one.

Phrase

A group of words that work together as a unit but lack the subject-verb pairing of a clause — "after lunch" (prepositional phrase), "laughing nervously" (participial phrase).

Relative Clause

A dependent clause led by a relative pronoun that modifies a noun. "The album that she recommended is incredible."

Noun Clause

A dependent clause doing the job of a noun. "Whoever finishes first wins the prize."

Adverbial Clause

A dependent clause working as an adverb and modifying a verb. "We left because it was getting late."

Appositive

A noun or noun phrase placed next to another noun to rename or explain it. "Our guide, a retired biologist, knew every trail."

Prepositional Phrase

A phrase starting with a preposition and ending with its object. "The keys are in the drawer."

Marks That Do the Heavy Lifting

Period (Full Stop)

The dot (.) that closes a statement or a polite command.

Comma

The curl (,) used to separate list items, peel off introductory material, join independent clauses with a conjunction, and wall off extra information that is not essential to the sentence.

Semicolon

The mark (;) that joins two independent clauses without a conjunction or separates items in a list when those items already contain commas.

Colon

The pair of dots (:) that sets up a list, explanation, quotation, or summary.

Apostrophe

The floating mark (') that marks possession (Luis's jacket) or signals missing letters in contractions (can't, I'm).

Quotation Marks

Matched symbols (" " or ' ') wrapped around direct speech, quoted material, or the titles of short works.

Hyphen

The short dash (-) that binds compound words together (mother-in-law), links compound modifiers before a noun (a well-written report), and attaches certain prefixes.

Em Dash

The long dash (—) that frames a parenthetical aside, introduces an elaboration, or marks a sudden shift in direction.

Ellipsis

Three dots (...) used to show that words have been left out of a quotation or that a thought trails away.

Oxford Comma (Serial Comma)

The comma placed before the final "and" or "or" in a list of three or more items. Different style guides disagree about whether to use it.

Arrangement, Style, and Register

Syntax

The study of how words and phrases are ordered to form grammatical sentences. Syntax rules govern word order, clause arrangement, and sentence structure.

Parallel Structure (Parallelism)

Keeping the same grammatical shape for items in a series or paired elements. "She enjoys hiking, reading, and baking," not "hiking, to read, and baking."

Agreement

Matching up related elements so they share the same features. Subject-verb agreement: a singular subject needs a singular verb. Pronoun-antecedent agreement: a pronoun matches its antecedent in number (and, where relevant, gender).

Modifier

A word, phrase, or clause that adds information about another element. Misplaced modifiers sit too far from what they describe; dangling modifiers have no clear thing to attach to at all.

Tone

The attitude a piece of writing projects through word choice, sentence rhythm, and stylistic decisions — warm, cold, playful, formal, skeptical.

Register

The formality level chosen to suit the audience, purpose, and situation — intimate, casual, neutral, formal, or technical.

Mistakes Writers Actually Make

Run-On Sentence

Two or more independent clauses jammed together without the punctuation or conjunction they need. Split them with a period, join them with a semicolon, or insert a coordinating conjunction.

Fragment

A piece that lacks the subject, verb, or completeness to function as a sentence. "Although the door was open." leaves the reader waiting for the rest.

Comma Splice

Gluing two independent clauses together with only a comma. Replace the comma with a period, a semicolon, or a comma plus a conjunction.

Double Negative

Two negative words stacked in the same clause. In standard English this reads as nonstandard. "She didn't see nobody" should be "She didn't see anybody."

Its vs. It's

"Its" marks possession (the cat licked its paw). "It's" is short for "it is" or "it has."

Their / There / They're

"Their" shows possession. "There" points to a location or introduces a sentence. "They're" is a contraction of "they are."

Who vs. Whom

"Who" works as the subject of a verb (Who called?). "Whom" works as the object of a verb or preposition (To whom did you speak?).

How to Absorb Grammar Vocabulary

• Read a lot, and read widely. Good prose teaches grammar faster than any worksheet.
• Look up word origins. "Grammar" comes from the Greek grammatikē, meaning the art of letters. Roots often explain the technical terms.
• Practice parsing. Pick a paragraph from a book and label its subjects, verbs, objects, clauses, and phrases until the structure clicks.
• Keep a reference handy. Style guides such as AP, Chicago, and MLA, plus a trusted grammar handbook, settle most disagreements.
• Write and revise often. Nothing teaches grammar like editing your own drafts.
• Broaden your English vocabulary. Grammar intersects with every other area of language — parts of speech, word roots, and grammar basics.

A confident command of grammar terms pays off every time you write a cover letter, explain an idea, or try to tell a good story. Bookmark this glossary, come back whenever a term slips your mind, and keep growing your language skills at dictionary.wiki.