Merriam-Webster's Collegiate® Dictionary, 11th Edition
ADJUNCT
I. noun
Etymology: Latin adjunctum, from neuter of adjunctus, past participle of adjungere
Date: 1588
something joined or added to another thing but not essentially a part of it,
2. a word or word group that qualifies or completes the meaning of another word or other words and is not itself a main structural element in its sentence, an adverb or adverb ial (as heartily in “They ate heartily” or at noon in “We left at noon”) attached to the verb of a clause especially to express a relation of time, place, frequency, degree, or manner,
3. an associate or assistant of another, an adjunct faculty member at a college or university, adjuvant b, adjunctive adjective
II. adjective
Date: 1594
added or joined as an accompanying object or circumstance, attached in a subordinate or temporary capacity to a staff , adjunctly adverb