auxiliary
/ɔːkˈsɪli.əɹi/noun
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A person or group that acts in an auxiliary manner.
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A sailing vessel equipped with an engine.
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(grammar) An auxiliary verb.
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A marching band colorguard.
adjective
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Helping; giving assistance or support.
"auxiliary troops"
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Supplementary or subsidiary.
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Held in reserve for exceptional circumstances.
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Of a ship, having both sails and an engine.
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(grammar) Relating to an auxiliary verb.
Synonyms:
motorsailer, accessory, accessory, ancillary