Auxiliary, which comes from the Latin noun auxilium, meaning “aid,” “assistance,” or “reinforcement,” is used in a wide range of capacities in English to describe a person or thing that assists another.

AUXILIARY definition: additional; supplementary; reserve. See examples of auxiliary used in a sentence.

AUXILIARY definition: 1. giving help or support, especially to a more important person or thing: 2. a person whose job…. Learn more.

An auxiliary is an organization that is connected with, but less important than, another organization; for example, an organization for the wives of the members of the main organization.

Jan 20, 2026 · Noun auxiliary (plural auxiliaries) A person or group that acts in an auxiliary manner.

Auxiliary definition: Giving assistance or support; helping.

an organization allied with, but subsidiary to, a main body of restricted membership, esp. one composed of members' relatives: The men's club and the ladies' auxiliary were merged into one organization.

• Baldwin was an important but fairly silent auxiliary to MacDonald. • The companion ladder, engine box and associated panels are very easy to remove, giving excellent access to the auxiliary.

Definition of auxiliary noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

auxiliary definition: supplementary or additional to the main. Check meanings, examples, usage tips, pronunciation, domains, and related words. Discover expressions like "auxiliary verb", "ladies' …