verb (used with object)

  1. to provide support for or relief to; help: to aid the homeless victims of the fire.
  2. to promote the progress or accomplishment of; facilitate.

verb (used without object)

  1. to give help or assistance.


  1. help or support; assistance.
  2. a person or thing that aids or furnishes assistance; helper; auxiliary.
  3. aids, Manège.
    1. Also called natural aids.the means by which a rider communicates with and controls a horse, as the hands, legs, voice, and shifts in weight.
    2. Also called artificial aids.the devices by means of which a rider increases control of a horse, as spurs, whip, and martingale.
  4. aide-de-camp.
  5. foreign aid.
  6. a payment made by feudal vassals to their lord on special occasions.
  7. English History. (after 1066) any of several revenues received by a king in the Middle Ages from his vassals and other subjects, limited by the Magna Charta to specified occasions.

n combining form

  1. denoting a charitable organization or function that raises money for a causeBand Aid; Ferryaid

abbreviation for

  1. acute infectious disease
  2. artificial insemination (by) donor: former name for Donor Insemination (DI)


  1. to give support to (someone to do something); help or assist
  2. (tr) to assist financially


  1. assistance; help; support
  2. a person, device, etc, that helps or assistsa teaching aid
  3. Also: artificial aid mountaineering any of various devices such as piton or nut when used as a direct help in the ascent
  4. (in medieval Europe; in England after 1066) a feudal payment made to the king or any lord by his vassals, usually on certain occasions such as the marriage of a daughter or the knighting of an eldest son
  5. in aid of British informal in support of; for the purpose of

early 15c., “wartime tax,” also “help, support, assistance,” from Old French aide, earlier aiudha “aid, help, assistance” (9c.), from Late Latin adjuta, from fem. past participle of Latin adiuvare (past participle adiutus) “to give help to,” from ad- “to” (see ad-) + iuvare “to help” (see adjutant). Meaning “thing by which assistance is given” is recorded from c.1600. Meaning “material help given by one country to another” is from 1940.


c.1400, “to assist, help,” from Old French aidier “help, assistance,” from Latin adiutare, frequentative of adiuvare (past participle adiutus) “give help to” (see adjutant). Related: Aided; aiding.


  1. artificial insemination donor
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