from The Century Dictionary.

  • To act or operate jointly with another or others to the same end; work or endeavor with another or together to promote the same object: as, Russia coöperated with Great Britain, Austria, and Prussia in reducing the power of Napoleon.
  • To unite in producing the same effect; tend to the same result: as, natural and moral events coöperate in illustrating the wisdom of the Creator.

from the GNU version of the Collaborative International Dictionary of English.

  • intransitive verb To act or operate jointly with another or others; to concur in action, effort, or effect.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb Alternative spelling of cooperate.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb work together on a common enterprise of project


Sorry, no etymologies found.


    Sorry, no example sentences found.


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  • "For example, in the spelling coöperate, the diaeresis reminds the reader that the word has four syllables co-op-er-ate, not three, *coop-er-ate. This is uncommon in English, as it is optional; The New Yorker's use of the mark is considered idiosyncratic."


    November 15, 2010

  • See discussion on coöperation.

    We have one more thing in common, rooz.

    November 16, 2010

  • Thanks, Pro. :-)

    November 16, 2010

  • Also, for example, reënter. I do enjoy using this style, but most often in writing, because yanking the diaeresis from Character Map takes too long, I'll settle for a hyphen, as co-ordinate, re-enforce.

    November 16, 2010

  • On a Mac (US keyboard), option+u then type the vowel.

    November 16, 2010