See more synonyms for aid on
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.

Origin of aid

1375–1425; (noun) late Middle English ayde < Anglo-French, Old French aide, noun derivative of aid(i)er < Latin adjūtāre to help (frequentative of adjuvāre), equivalent to ad- ad- + -jū- help + -t- frequentative suffix + -āre infinitive suffix; (v.) < Anglo-French, Old French aid(i)er < Latin, as above
Related formsaid·er, nounaid·ful, adjectiveaid·less, adjectiveun·aid·ed, adjectiveun·aid·ed·ly, adverbun·aid·ing, adjective
Can be confusedaid aide (see usage note at the current entry)aides aids AIDS

Synonyms for aid

See more synonyms for on
1. See help. 2. abet, back, foster, advance. 4. succor; relief; subsidy, grant.

Antonyms for aid

Usage note

Although the nouns aid and aide both have among their meanings “an assisting person,” the spelling aide is increasingly used for the sense “helper, assistant”: One of the senator's aides is calling. Aide in military use is short for aide-de-camp. It is also the spelling in nurse's aide. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for aider

Historical Examples of aider

  • What would he not give, or say, or do, to find me his aider and abettor?

    Lord Kilgobbin

    Charles Lever

  • He is the friend and aider of those who would live in the spirit.

    Discourses in America

    Matthew Arnold

  • Is it to forsake the slave when I cease to be the aider and abettor of his master?

    William Lloyd Garrison

    Archibald H. Grimke

  • Mr. and Mrs. Merrywinkle are a couple who coddle themselves; and the venerable Mrs. Chopper is an aider and abettor in the same.

    Sketches by Boz

    Charles Dickens

  • One may be an aider and supporter of a party or church, while not an adherent to all its doctrines or claims.

    English Synonyms and Antonyms

    James Champlin Fernald

British Dictionary definitions for aider



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
Derived Formsaider, noun

Word Origin for aid

C15: via Old French aidier from Latin adjūtāre to help, from juvāre to help
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for aider



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.

Online Etymology Dictionary, © 2010 Douglas Harper

aider in Medicine


  1. artificial insemination donor
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.