United with another (generally in a subordinate capacity) in office or in action of any kind: as, an adjunct professor. Added to or conjoined with, as a consequence; attending; accompanying.n. Something added to another, but not essentially a part of it.n. A person joined to another in some duty or service; an assistant or subordinate colleague.n. In metaphysics, any quality of a thing not pertaining to its essence.n. In grammar, a word or a number of words added to define, limit, or qualify the force of another word or other words; a word or phrase having value in a sentence only as dependent on another member of the sentence, as an adjective, an adverb, the words of a dependent clause, etc.n. In music, a scale or key closely related to another; a relative scale or key.