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root

noun [C] (OF WORD)
 
 
/ruːt/ specialized

Definition

The root of a word is its most basic form, to which other parts, such as affixes, can be added: The root of the word 'sitting' is 'sit'.Morphology and parts of words
(Definition of root noun (OF WORD) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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