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Alternative forms


Cooperate (third-person singular simple present Cooperates, present participle cooperating, simple past and past participle cooperated)

  1. (intransitive) To work or act together, especially for a common purpose or benefit.
  2. (intransitive) To allow for mutual unobstructed action
  3. (intransitive) To function in harmony, side by side
  4. (intransitive) To engage in economic cooperation.


The usual pronunciation of 'oo' is /uː/ or /ʊ/. The dieresis in the spelling coöperate emphasizes that the second o begins a separate syllable. However, the dieresis is becoming increasingly rare in US English typography, so the spelling cooperate predominates. See also Appendix:Dieresis.

Adverbs for Cooperate

alternately; enthusiastically; gladly; consciously; respectably; willingly; harmoniously; courteously; advantageously; wholesomely; benevolently; mechanically; agriculturally; heartily; voluntarily; sympathetically; spontaneously; successfully.

Synonyms for Cooperate

coact, make common cause, aid, assist, help, work with, combine, fraternize, connive, plan, perform, relieve, support, second, approve, endorse, promote, forward, encourage.

Antonyms for Cooperate

hinder, obstruct, retard, delay, encumber, handicap, impede, disturb, annoy, prevent.

Related terms


accord, acquiesce, act in concert, act together, affiliate, agree, ally, alternate, amalgamate, answer to, apportion, assent, assist, associate, assort with, band, band together, bandy, be agreeable to, be consistent, be dying to, be eager, be game, be in cahoots, be in league, be of one, be open to, be partners in, be quits with, be ready, be spoiling for, be uniform with, be willing, change, check, chime, club together, coact, coadunate, coalesce, cohere, coincide, collaborate, collude, combine, commute, compensate, concert, concord, concur, confederate, conform, conform with, conjoin, connive, consent, consist with, consolidate, conspire, contribute, correspond, counterchange, divide with, divvy up with, do business with, dovetail, engage, exchange, fall in together, federate, fit together, fuse, get back at, get even with, get heads together, get together, give and take, go along with, go even stephen, go fifty-fifty, go halvers, go halves, go partners, go shares, go together, go with, halve, hang together, happen together, harmonize, help, hit, hold together, hook up, incline, interact, interchange, interlace, interlock, intermesh, interplay, intersect, intertwine, interweave, interwork, jibe, join, join forces, join in, join together, keep together, league, league together, lean, lend a hand, lock, logroll, look kindly upon, make common cause, match, merge, mesh, mortise, not hesitate to, overlap, parallel, participate, partner, pay back, permute, play ball, plunge into, pull together, put heads together, reciprocate, register, register with, requite, respond, respond to, retaliate, return, return the compliment, share, share in, sing in chorus, sort with, split the difference, square, square with, stand together, swap, switch, synchronize, synergize, tally, team up, throw in together, tie in, tie up, trade, transpose, unite, unite efforts, work together, would as leave, would as lief


Originated 1595–1605 from Late Latin cooperatus (work with). See co- + operate.







  1. second-person plural present indicative of cooperare
  2. second-person plural imperative of cooperare
  3. Feminine plural of cooperato