adjunct >> /ˈæˌdʒəŋkt/
Definition: [noun] A thing added to something else as a supplementary rather than an essential part.
Example: computer technology is an adjunct to learning
Definition: [noun] A word or phrase used to amplify or modify the meaning of another word or words in a sentence.
Example: The LION database of English poetry has 144 instances of ‘under God’, and quite a few of them seem to me to be unambiguously locative adjuncts modifying noun phrases.
Definition: [adjective] Connected or added to something, typically in an auxiliary way.
Example: other alternative or adjunct therapies include immunotherapy