American English

Definition of prefix noun from the Oxford Advanced American Dictionary



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  1. 1(grammar) a letter or group of letters added to the beginning of a word to change its meaning, such as un- in unhappy and pre- in preheat compare affix, suffix
  2. 2a word, letter, or number that is put before another Our car insurance policies have the prefix AYN.
  3. 3(old-fashioned) a title such as Dr. or Mrs. used before a person's name
See the Oxford Advanced Learner's Dictionary entry: prefix

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