inflection - definition and synonyms

noun 

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/ɪnˈflekʃ(ə)n/
singularinflection
pluralinflections
  1. 1
    [uncountable] the way that the sound of your voice goes up and down when you speak
  2. 2
    [uncountable] linguistics changes in the basic form of a word to show something such as tense or number
    1. a.
      [countable] the form of a word that is not the basic form
    2. b.
      [countable] an addition or a change to the basic form of a word