American English

Definition of modifier noun from the Oxford Advanced American Dictionary

 

modifier

 noun
noun
NAmE//ˈmɑdəˌfaɪər//
 
(grammar)
 
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a word, such as an adjective or adverb, that describes another word or group of words, or restricts its/their meaning in some way In “speak quietly,” the adverb “quietly” is a modifier. compare postmodifier, premodifier
See the Oxford Advanced Learner's Dictionary entry: modifier