General English


  • noun part of a word added at the beginning of a word to alter the meaning



  • The code which identifies a central office. In the NPA-NXX-XXXX ten-digit telephone number format, it is the NXX portion, where N can be any digit between 2 and 9, and X can be any digit between 0 and 9. A single central office may serve more than one prefix. Also called central office prefix, central office code, or NXX code.
  • A word element which is affixed to the front of a word to produce a form with a different or derived meaning. For example, the tera- portion of terabyte.
  • A letter, number, symbol, or the like, placed before something else. For instance, the Q in Q15.

Information & Library Science

  • noun a word or letters added to the front of another word, which can change its meaning, e.g. in ‘undone’, ‘misread’