Definition of co- in English:



  • 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
  • 4 Mathematics Of the complement of an angle: cosine
  • 4.1The complement of: co-latitude


from Latin, originally a form of com-.

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
elaborate ornamentation of a vocal melody