1. Something joined or added to another thing, but not essentially a part of it. Learning is but an adjunct to our self. (Shak)
2. A person joined to another in some duty or service; a colleague; an associate.
3. A word or words added to quality or amplify the force of other words; as, the history of the American revolution, where the words in italics are the adjunct or adjuncts of History.
4. (Science: psychology) a quality or property of the body or the mind, whether natural or acquired; as, colour, in the body, judgment in the mind.
5. A key or scale closely related to another as principal; a relative or attendant key. See Attendant keys, under Attendant, a.
Relating to something that is added but is not essential; an ancillary pump; an adjuvant discipline to forms of mysticism; The mind and emotions are auxilliary to each other.