Definition of co- in English:

co-

prefix

  • 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-.

Pronunciation

co-

/kəʊ/