adjunct

noun

1. something added to another thing but not essential to it.
2. a person associated with lesser status, rank, authority, etc., in some duty or service; assistant.
3. a person working at an institution, as a college or university, without having full or permanent status: My lawyer works two nights a week as an adjunct, teaching business law at the college.
4. Grammar. a modifying form, word, or phrase depending on some other form, word, or phrase, especially an element of clause structure with adverbial function.

adjective

5. joined or associated, especially in an auxiliary or subordinate relationship.
6. attached or belonging without full or permanent status: an adjunct surgeon on the hospital staff.

noun

1. something incidental or not essential that is added to something else
2. a person who is subordinate to another
3. grammar
   1. part of a sentence other than the subject or the predicate
   2. (in systemic grammar) part of a sentence other than the subject, predicator, object, or complement; usually a prepositional or adverbial group
   3. part of a sentence that may be omitted without making the sentence ungrammatical; a modifier
4. logic another name for accident (def. 4)

adjective

5. added or connected in a secondary or subordinate position; auxiliary

n.

1580s, from Latin adjunctus “closely connected, joined, united;” as a noun, “a characteristic, essential attribute,” past participle of adjungere “join to” (see adjoin).

adj.

1590s, from Latin adjunctus “closely connected, joined, united,” past participle of adjungere “join to” (see adjoin). Adjunct professor is 1826, American English.