1. [n]  a construction that is part of a sentence but not essential to its meaning and can be omitted without making the sentence ungrammatical
2. [n]  something added to another thing but not an essential part of it
3. [n]  a person who is an assistant or subordinate to another
4. [adj]  of or relating to a person who is subordinate to another
5. [adj]  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"

ADJUNCT is a 7 letter word that starts with A.

1. \Ad"junct`\, a. [L. adjunctus, p. p. of adjungere. See
   {Adjoin}.]
   Conjoined; attending; consequent.
         Though that my death were adjunct to my act. --Shak.
   {Adjunct notes} (Mus.), short notes between those essential
      to the harmony; auxiliary notes; passing notes.
   

2. \Ad"junct`\, n.
   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. --Wotton.
   3. (Gram.) 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. (Metaph.) A quality or property of the body or the mind,
      whether natural or acquired; as, color, in the body,
      judgment in the mind.
   5. (Mus.) A key or scale closely related to another as
      principal; a relative or attendant key. [R.] See
      {Attendant keys}, under {Attendant}, a.