auxiliary

/ɔːkˈsɪli.əɹi/

noun

  1. A person or group that acts in an auxiliary manner.

  2. A sailing vessel equipped with an engine.

  3. (grammar) An auxiliary verb.

  4. A marching band colorguard.

adjective

  1. Helping; giving assistance or support.

    "auxiliary troops"

  2. Supplementary or subsidiary.

  3. Held in reserve for exceptional circumstances.

  4. Of a ship, having both sails and an engine.

  5. (grammar) Relating to an auxiliary verb.

Synonyms: motorsailer, accessory, accessory, ancillary