Definition of postmodifier noun from the Oxford Advanced American Dictionary

 

postmodifier

 noun
noun
NAmE//ˌpoʊstˈmɑdəˌfaɪər//
 
(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, and is placed after it/them In “run fast,” the adverb “fast” is a postmodifier. compare modifier, premodifier
See the Oxford Advanced Learner's Dictionary entry: postmodifier