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Noun: prefix  'pree,fiks
  1. An affix that is added in front of the word
    "In 'unhappy,' 'un-' is a prefix meaning 'not'"
Verb: prefix  'pree,fiks
  1. Attach a prefix to
    "prefixed words"

Derived forms: prefixed, prefixes, prefixing

Type of: affix

Antonym: suffix

Encyclopedia: Prefix