Auxiliary
Auxiliary adjective - Available to supply something extra when needed.
Usage example: the auditorium has an auxiliary cooling system used only on particularly sweltering days
Needed
Needed adjective - Impossible to do without.
Both words in one sentence
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The Civil Air Patrol is a civilian organization whose mission includes serving as an Auxiliary of the Air Force when needed.
Source: Home Guard -
For example, the Amateur Radio Emergency Service and the Military Auxiliary Radio Service both serve to provide government agencies with additional/backup communications support when needed.
Source: Home Guard
Cite this Source
Needed and Auxiliary. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/auxiliary/needed
Auxiliary & Needed. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/auxiliary/needed>.
Needed or Auxiliary. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/auxiliary/needed.
Google Ngram Viewer shows how "auxiliary" and "needed" have occurred on timeline