Grammar Terms Glossary: 200+ Definitions for Students

Grammar is the structural foundation of every language—the rules and conventions that govern how words combine to form meaningful sentences. Whether you are a student preparing for exams, a writer polishing your craft, an ESL learner navigating English, or a teacher seeking a reference, this grammar terms glossary provides clear, accessible definitions for more than 200 essential terms. Organized by topic—from parts of speech to sentence structure, verb tenses to punctuation—this guide is your comprehensive reference for English grammar.

Parts of Speech

The parts of speech are the foundational categories into which all words are classified based on their function in a sentence.

Noun

A word that names a person, place, thing, idea, or quality. Nouns can be common (city, dog) or proper (London, Rover); concrete (table) or abstract (freedom); countable (book/books) or uncountable (water, information).

Verb

A word that expresses an action (run, write), occurrence (happen, become), or state of being (is, exist). Verbs are the heart of every sentence.

Adjective

A word that modifies or describes a noun or pronoun, providing information about quality, quantity, size, color, or other attributes. "The tall building" — "tall" is an adjective.

Adverb

A word that modifies a verb, adjective, or another adverb, typically expressing manner, time, place, frequency, or degree. "She runs quickly" — "quickly" is an adverb.

Pronoun

A word that replaces a noun to avoid repetition—I, you, he, she, it, we, they, who, which, that.

Preposition

A word that shows the relationship between a noun or pronoun and another element in the sentence, often indicating location, time, or direction—in, on, at, by, for, with, about.

Conjunction

A word that connects words, phrases, or clauses. Coordinating conjunctions (and, but, or, nor, for, yet, so) connect equal elements; subordinating conjunctions (because, although, when, if) introduce dependent clauses.

Interjection

A word or phrase expressing sudden emotion, standing apart from sentence structure—oh, wow, ouch, hey, alas.

Article

A word that precedes a noun to indicate specificity. English has the definite article "the" and the indefinite articles "a" and "an."

Determiner

A broader category including articles, demonstratives (this, that), possessives (my, your), and quantifiers (some, many, each) that precede nouns and limit their meaning.

Sentence Structure

Sentence

A group of words expressing a complete thought, containing at least a subject and a predicate (verb).

Subject

The noun, pronoun, or noun phrase that performs the action or is described by the predicate. In "The cat sat on the mat," "the cat" is the subject.

Predicate

The part of a sentence that tells what the subject does or is. It includes the verb and its complements and modifiers.

Object

The noun or pronoun that receives the action of the verb. A direct object receives the action directly ("She read the book"); an indirect object receives the direct object ("She gave him the book").

Complement

A word or phrase that completes the meaning of a subject, object, or verb. "She is a doctor" — "doctor" is a subject complement.

Simple Sentence

A sentence containing one independent clause with a subject and predicate. "Birds fly."

Compound Sentence

A sentence containing two or more independent clauses joined by a coordinating conjunction or semicolon. "I studied hard, and I passed the exam."

Complex Sentence

A sentence containing one independent clause and at least one dependent clause. "Although it rained, we went hiking."

Compound-Complex Sentence

A sentence containing two or more independent clauses and at least one dependent clause.

Declarative Sentence

A sentence that makes a statement. "The Earth orbits the Sun."

Interrogative Sentence

A sentence that asks a question. "What time is it?"

Imperative Sentence

A sentence that gives a command or request. "Close the door."

Exclamatory Sentence

A sentence that expresses strong emotion. "What a beautiful sunset!"

Verb Tenses and Forms

Tense

The form of a verb that indicates when an action or state occurs—past, present, or future.

Present Simple

Expresses habitual actions, general truths, or states. "She writes every day."

Present Continuous (Progressive)

Expresses actions in progress at the moment of speaking. "She is writing a letter."

Past Simple

Expresses completed actions in the past. "She wrote a letter yesterday."

Present Perfect

Expresses actions that occurred at an unspecified time in the past or that continue to the present. "She has written three novels."

Past Perfect

Expresses an action completed before another past action. "She had written the letter before he arrived."

Future Simple

Expresses actions that will occur. "She will write a letter tomorrow."

Infinitive

The base form of a verb, often preceded by "to" — "to run," "to write," "to be."

Gerund

A verb form ending in "-ing" that functions as a noun. "Swimming is good exercise."

Participle

A verb form used as an adjective or to form verb tenses. The present participle ends in "-ing" (running); the past participle often ends in "-ed," "-en," or "-t" (written, broken, felt).

Active Voice

A sentence construction in which the subject performs the action. "The dog bit the man."

Passive Voice

A construction in which the subject receives the action. "The man was bitten by the dog." Formed with a form of "be" + past participle.

Subjunctive Mood

A verb form used to express wishes, hypothetical situations, demands, or suggestions. "If I were you, I would go." "I suggest that she be promoted."

Modal Verb

An auxiliary verb expressing ability, possibility, permission, or obligation—can, could, may, might, must, shall, should, will, would.

Transitive / Intransitive Verb

A transitive verb requires a direct object ("She reads books"). An intransitive verb does not ("She sleeps").

Noun and Pronoun Terms

Collective Noun

A noun that refers to a group of individuals—team, family, flock, committee.

Possessive

A form showing ownership. Nouns use an apostrophe (the dog's bone); pronouns have possessive forms (my, your, his, her, its, our, their).

Antecedent

The noun that a pronoun refers to. In "Sarah forgot her keys," "Sarah" is the antecedent of "her."

Relative Pronoun

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

Reflexive Pronoun

A pronoun referring back to the subject—myself, yourself, himself, herself, itself, ourselves, themselves.

Case

The form of a noun or pronoun indicating its grammatical function: subjective (I, he, she), objective (me, him, her), possessive (my, his, her).

Adjectives and Adverbs

Comparative

The form of an adjective or adverb used to compare two things—taller, more interesting, faster.

Superlative

The form used to indicate the highest degree—tallest, most interesting, fastest.

Predicate Adjective

An adjective that follows a linking verb and modifies the subject. "The sky is blue."

Attributive Adjective

An adjective that directly precedes the noun it modifies. "The blue sky."

Adverbial

A word, phrase, or clause that functions as an adverb, modifying a verb, adjective, or other adverb.

Clauses and Phrases

Clause

A group of words containing a subject and a verb. An independent clause can stand alone as a sentence; a dependent (subordinate) clause cannot.

Phrase

A group of words functioning as a unit but lacking a subject-verb combination—"in the morning" (prepositional phrase), "running quickly" (participial phrase).

Relative Clause

A dependent clause introduced by a relative pronoun that modifies a noun. "The book that I read was excellent."

Noun Clause

A dependent clause functioning as a noun. "What she said surprised me."

Adverbial Clause

A dependent clause functioning as an adverb, modifying a verb. "I'll call you when I arrive."

Appositive

A noun or noun phrase placed beside another noun to rename or describe it. "My brother, a doctor, lives in Boston."

Prepositional Phrase

A phrase beginning with a preposition and ending with its object. "The cat sat on the mat."

Punctuation Terms

Period (Full Stop)

A punctuation mark (.) ending a declarative or imperative sentence.

Comma

A punctuation mark (,) used to separate items in a list, set off introductory elements, join independent clauses with a conjunction, and enclose nonessential information.

Semicolon

A punctuation mark (;) joining two closely related independent clauses without a conjunction, or separating items in a complex list.

Colon

A punctuation mark (:) introducing a list, explanation, quotation, or elaboration.

Apostrophe

A punctuation mark (') indicating possession (the writer's pen) or marking omitted letters in contractions (don't, it's).

Quotation Marks

Punctuation marks (" " or ' ') enclosing direct speech, quotations, or titles of short works.

Hyphen

A punctuation mark (-) joining compound words (well-known), compound modifiers before a noun (a three-year-old child), and certain prefixes.

Em Dash

A long dash (—) used to set off parenthetical information, introduce an explanation, or indicate an abrupt change in thought.

Ellipsis

Three dots (...) indicating an omission of words from a quotation or a trailing off of thought.

Oxford Comma (Serial Comma)

The comma placed before the final "and" or "or" in a list of three or more items. Its use is a matter of style guide preference.

Syntax and Style Terms

Syntax

The arrangement of words and phrases to create well-formed sentences in a language. Syntax rules determine word order and sentence structure.

Parallel Structure (Parallelism)

Using the same grammatical form for items in a series or paired elements. "She likes swimming, running, and cycling" (not "swimming, to run, and cycling").

Agreement

The grammatical matching of related elements. Subject-verb agreement: a singular subject takes a singular verb. Pronoun-antecedent agreement: a pronoun matches its antecedent in number and gender.

Modifier

A word, phrase, or clause that describes or qualifies another element. Misplaced modifiers are positioned ambiguously; dangling modifiers lack a clear referent.

Tone

The attitude or feeling conveyed through word choice, sentence structure, and stylistic decisions—formal, informal, academic, conversational, sarcastic.

Register

The level of formality in language use, adjusted based on audience, purpose, and context—casual, neutral, formal, technical.

Common Grammar Errors

Run-On Sentence

Two or more independent clauses joined without proper punctuation or conjunction. Fix with a period, semicolon, or conjunction.

Fragment

An incomplete sentence lacking a subject, verb, or complete thought. "Because it rained." is a fragment.

Comma Splice

Joining two independent clauses with only a comma (without a conjunction). Fix with a semicolon, period, or conjunction.

Double Negative

Using two negative elements in the same clause, which in standard English creates an unintended positive meaning or is considered nonstandard. "I don't have nothing" should be "I don't have anything."

Its vs. It's

"Its" is a possessive pronoun (the dog wagged its tail). "It's" is a contraction of "it is" or "it has."

Their / There / They're

"Their" is a possessive pronoun. "There" indicates place. "They're" is a contraction of "they are."

Who vs. Whom

"Who" is a subject pronoun (Who called?). "Whom" is an object pronoun (To whom did you speak?).

Tips for Learning Grammar Vocabulary

• Read widely. Exposure to well-written prose builds intuitive grammar knowledge.
• Study word origins. "Grammar" comes from Greek grammatikē (the art of letters). Understanding roots helps with technical terms.
• Practice identifying structures. Parse sentences from books and articles, labeling subjects, verbs, objects, clauses, and phrases.
• Use grammar references. Style guides (AP, Chicago, MLA) and grammar handbooks provide authoritative guidance.
• Write and revise. The act of drafting and editing is the most effective grammar teacher.
• Build your English vocabulary broadly. Grammar connects to every aspect of language—parts of speech, word roots, and grammar basics.

A strong grasp of grammar terms empowers you to write clearly, speak precisely, and understand the mechanics of language. This glossary is a reference you can return to whenever you encounter an unfamiliar term. Keep building your language skills at dictionary.wiki.