Meaning of “prefix” in the English Dictionary

american-english dictionary
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"prefix" in British English

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prefixnoun [ C ]

uk /ˈpriː.fɪks/ us /ˈpriː.fɪks/

prefix noun [ C ] (GRAMMAR)

B2 language a letter or group of letters added to the beginning of a word to make a new word:

In the word "unimportant", "un-" is a prefix.
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(Definition of “prefix” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"prefix" in American English

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prefixnoun [ C ]

us /ˈpri·fɪks/

grammar a letter or group of letters added to the beginning of a word to change the meaning or make a new word:

In the words "unknown" and "unusual," "un-" is a prefix meaning "not."

(Definition of “prefix” from the Cambridge Academic Content Dictionary © Cambridge University Press)