adjunct

1 a person who helps a more skilled person <serving as an adjunct to the congressional delegation on its fact-finding mission> Synonyms helper, adjutant, aid, aide, apprentice, assistant, coadjutor, deputy, helpmate, helpmeet, lieutenant, mate, sidekickRelated Words attendant, handmaiden (also handmaid), maid, maidservant, scullion, servant; auxiliary, legman, subordinate, underling; employee (also employe), hand, help, hireling, laborer, swamper, worker; gal Friday, girl Friday; man Friday, right hand; aide-de-camp

2 something that is not necessary in itself but adds to the convenience or performance of the main piece of equipment <you can spend a lot on camera accessories, but this nifty little battery recharger is the one adjunct that will pay for itself> Synonyms accoutrement (or accouterment), adapter (also adaptor), add-on, accessory, appendage, appliance, attachment, optionRelated Words accompaniment, additive, complement, supplement; auxiliary, subsidiary; amenity, doodad, embroidery, extra, filler, frill, incidental, luxury, nonessential, nonnecessity; appurtenances, bells and whistles, equipment, furnishings, habiliment(s), paraphernalia, trappings; adornment, decoration, embellishment, enhancement, garnish, ornament, trim, trimmingNear Antonyms essential, necessity, requirement, requisite