auxiliaire

Etymology 1
, from.

Adjective

 * 1)  auxiliary

Etymology 2
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Noun

 * 1)  a helping verb, an auxiliary verb (verb that, having lost its literal meaning, joins itself to a certain form of another verb, for example to a past participle, to show a grammatical feature such as tense, voice, aspect, etc. In French, avoir and être are tense auxiliaries)