say it: ahg-ZI-lyur-ee
auxiliary is an adjective and noun meaning "functioning in a supporting capacity". It carries 3 recorded senses.
furnishing added support
“an ancillary pump”
“an adjuvant discipline to forms of mysticism”
“The mind and emotions are auxiliary to each other”
someone who acts as assistant
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for auxiliary come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.