Auxiliary and First class

Opposite meaning terms

Auxiliary adjective - Available to supply something extra when needed.

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First class is an antonym for auxiliary.

First class noun - Mail that includes letters and postcards and packages sealed against inspection.

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Auxiliary is an antonym for first class in topics: best, highest in importance.

Cite this Source

First class and Auxiliary. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/auxiliary/first_class

Auxiliary & First class. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/auxiliary/first_class>.

First class or Auxiliary. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/auxiliary/first_class.

Google Ngram Viewer shows how "auxiliary" and "first class" have occurred on timeline