prefix - definition and synonyms

noun [countable] 

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/ˈpriːfɪks/
singularprefix
pluralprefixes
  1. 1
    linguistics a group of letters that is added to the beginning of a word to change its meaning. For example, the prefix ‘un-’ is added to the wordtidy’ to form ‘untidy’.
    See also affix2, suffix
  2. 2
    a title such as ‘Dr’ or ‘Mrs’ that is used before someone’s name
     Synonyms and related words