An appositive is a noun or noun phrase is placed next to another that gives some information, explanation or renames it: The dog, a West Highland White, started barking. a West Highland White, is the [..]

1690s, from Latin appositus, past participle of apponere "to put to" (see apposite) + -ive. As a noun, from 1847.

An appositive is a noun, noun phrase, or noun clause which follows a noun or pronoun and renames or describes the noun or pronoun. A simple appositive is an epithet like Alexander the Great. Appositiv [..]

(adj) relating to or being in apposition

a noun or noun phrase that identifies or modifies the noun or pronoun that comes immediately before it—e.g., Joey, my boyfriend, wanted pizza.

a noun or noun phrase placed next to another noun to further identify or clarify it ("Neil Armstrong, the first American to walk on the moon, was born in Ohio").

a noun or noun phrase that re-identifies or describes its neighbouring noun e.g. "Canada, a multicultural country, is recognized by its maple leaf flag."

  A noun, noun phrase, or noun clause that follows a noun or pronoun and identifies or explains it, or supplements its meaning. Commas sometimes set off the appositive (e.g., a biography of the genius [..]

(grammar): a word or phrase that is in apposition.