Something attached to another in a dependent or subordinate position. See Synonyms at appendage.
A person associated with another in a subordinate or auxiliary capacity.
Grammar A clause or phrase added to a sentence that, while not essential to the sentence's structure, amplifies its meaning, such as for several hours in We waited for several hours.
Logic A nonessential attribute of a thing.
adj.
Added or connected in a subordinate or auxiliary capacity: an adjunct clause.
Attached to a faculty or staff in a temporary or auxiliary capacity: an adjunct professor of history.
[From Latin adiūnctus, past participle of adiungere, to join to; see adjoin.] ad·junc'tion (ə-jŭngk'shən) n., ad·junc'tive adj.
Main Entry: ad·junc·tive Pronunciation: &-'j&[ng](k)-tiv, a- Function: adjective : involving the medical use of an adjunct<adjunctive therapy> —ad·junc·tive·lyadverb
[uh-juhngk-tiv] 
tɪv