Definition of lemmatize in English:

lemmatize

(also lemmatise)

verb

[WITH OBJECT]
  • Sort so as to group together inflected or variant forms of the same word.

    ‘we use an automatic analyser to lemmatize the running words’
    • ‘The vocabulary lists were next lemmatized by hand.’
    • ‘Every word of these texts is tagged, lemmatized, and hypertext-linked to the Liddell-Scott (an abridged version), Louw-Nida, Friberg, Thayer, or Barclay-Newman lexicons.’

Pronunciation

lemmatize

/ˈlɛmətʌɪz/