Auxiliary; serving as a supplement or secondary support; helping or assisting a main function or purpose.
From Latin 'auxiliaris' (helpful, assisting), derived from 'auxilium' (help). A variant or Latinate form of 'auxiliary' sometimes appearing in technical or formal contexts.
Spanish and Portuguese speakers use 'auxiliar' more commonly than English speakers use this variant, revealing how Romance languages preserved the Latin root more directly than English did when we adopted 'auxiliary.'
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