Definitions
Century Dictionary and Cyclopedia
- 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.
Wiktionary
- v. alternative spelling of cooperate.
GNU Webster's 1913
- v. To act or operate jointly with another or others; to concur in action, effort, or effect.
WordNet 3.0
- v. work together on a common enterprise of project
Examples
Sorry, no example sentences found.
Lists
These user-created lists contain the word ‘coöperate’.
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The New Yorker's style manual
This list is my attempt to figure out The New Yorker's style and usage guidelines. It is based on reading articles within the pages of that venerable magazine and working backward. Feel free to add...
coöperate, diaeresis, trema, dieresis, t. h. white write..., updike plug, meracious eclecti..., kael without fail, E.B. White, coöperation, zoölogical, reënter and 14 more...
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rememberers
prolix, ageusia, animadversion, anodyne, antic, arabesque, beadle, brachymetropia, colophon, desquamation, diaphoresis, diegesis and 3250 more...
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intriguing words
words that intrigue me in some way...
terrific, surculus, anon, arch, disinterested, remittance man, coöperate, dieresis, towards, mottle, dapple, lithe and 1 more...
Tweets
Looking for tweets for coöperate.

Prolagus On a Mac (US keyboard), option+u then type the vowel. Nov 16, 2010
milosrdenstvi 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. Nov 16, 2010
ruzuzu Thanks, Pro. :-) Nov 16, 2010
Prolagus See discussion on coöperation.
We have one more thing in common, rooz. Nov 16, 2010
ruzuzu "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."
--Wikipedia Nov 15, 2010