Definition of co- in English:

co-

prefixkəʊ

1(forming nouns) joint; mutual; common.
co-driver
co-education
2(forming adjectives) jointly; mutually.
coequal
3(forming verbs) together with another or others.
co-produce
4Mathematics
Of the complement of an angle.
cosine
1. 4.1 The complement of.
  co-latitude

Origin

From Latin, originally a form of com-.

Definition of co- in US English:

co-

prefixkōkoʊ

1(forming nouns) joint; mutual; common.
coeducation
2(forming adjectives) jointly; mutually.
coequal
3(forming verbs) together with another or others.
coproduce
co-own
4Mathematics
Of the complement of an angle.
cosine
1. 4.1 The complement of.
  colatitude
  coset

Usage

In modern American English, the tendency increasingly is to write compound words beginning with co- without hyphenation, as in costar, cosignatory, and coproduce. British usage generally tends more often to show a preference for the older, hyphenated spelling, but even in Britain the trend seems to be in favor of less hyphenation than in the past. In both the US and the UK, for example, the spellings of coordinate and coed are encountered with or without hyphenation, but the more common choice for either word in either country is without the hyphen. Co- with the hyphen is often used in compounds that are not yet standard (co-golfer), or to prevent ambiguity (co-driver—because codriver could be mistaken for cod river), or simply to avoid an awkward spelling (co-own is clearly preferable to coown). There are also some relatively less common terms, such as co-respondent (in a divorce suit), where the hyphenated spelling distinguishes the word's meaning and pronunciation from that of the more common correspondent

Origin

From Latin, originally a form of com-.

单词	co-
释义	Definition of co- in English: co- prefixkəʊ 1(forming nouns) joint; mutual; common. co-driver co-education 2(forming adjectives) jointly; mutually. coequal 3(forming verbs) together with another or others. co-produce 4Mathematics Of the complement of an angle. cosine 4.1 The complement of. co-latitude Origin From Latin, originally a form of com-. Definition of co- in US English: co- prefixkōkoʊ 1(forming nouns) joint; mutual; common. coeducation 2(forming adjectives) jointly; mutually. coequal 3(forming verbs) together with another or others. coproduce co-own 4Mathematics Of the complement of an angle. cosine 4.1 The complement of. colatitude coset Usage In modern American English, the tendency increasingly is to write compound words beginning with co- without hyphenation, as in costar, cosignatory, and coproduce. British usage generally tends more often to show a preference for the older, hyphenated spelling, but even in Britain the trend seems to be in favor of less hyphenation than in the past. In both the US and the UK, for example, the spellings of coordinate and coed are encountered with or without hyphenation, but the more common choice for either word in either country is without the hyphen. Co- with the hyphen is often used in compounds that are not yet standard (co-golfer), or to prevent ambiguity (co-driver—because codriver could be mistaken for cod river), or simply to avoid an awkward spelling (co-own is clearly preferable to coown). There are also some relatively less common terms, such as co-respondent (in a divorce suit), where the hyphenated spelling distinguishes the word's meaning and pronunciation from that of the more common correspondent Origin From Latin, originally a form of com-.
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