Meaning of AUXILIARY in English

[adjective], [noun] - (someone or something) giving help or support, esp. to a more important person or thingauxiliary staffan auxiliary vessel/engine/power unit/systemThe assistants will receive auxiliary rates of pay.Auxiliaries are soldiers of one country who fight for another country.(UK) Auxiliary nurses/Nursing auxiliaries (US Nurses' aides) (ANZ Nursing aids) help nurses to take care of people.An auxiliary (verb) gives grammatical information, for example about tense, which is not given by the main verb of a sentence.The first verb in each of the following sentences is an auxiliary - 'When did you arrive?', 'I would love a drink', 'She has finished her book'.

Cambridge English vocab.      Кембриджский английский словарь.