What is auxiliary?

  • (adj): Functioning in a subsidiary or supporting capacity.
    Example: "The main library and its auxiliary branches"
    Synonyms: subsidiary, supplemental, supplementary
    See also — Additional definitions below

Some articles on auxiliary:

Subject-auxiliary Inversion - Inversion With Other Types of Verb
... takes place where the verb is not restricted to an auxiliary verb ... Examples of non-auxiliary verbs being used in typical subject–auxiliary inversion patterns may be found in older texts or in English written in an archaic style ...

More definitions of "auxiliary":

  • (noun): Someone who acts as assistant.
    Synonyms: aide