adjunct (n.) Look up adjunct at Dictionary.com
1580s, from Latin adjunctus "closely connected, joined, united;" as a noun, "a characteristic, essential attribute," past participle of adjungere "join to" (see adjoin).
adjunct (adj.) Look up adjunct at Dictionary.com
1590s, from Latin adjunctus "closely connected, joined, united," past participle of adjungere "join to" (see adjoin). Adjunct professor is 1826, American English.