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.
See also

More examples

  • 'un' is one of the most common prefixes in English.
  • A suffix is added at the end of a word, and a prefix is added to the beginning.
  • Prefixes can be used to create new words in English.
  • 'Eco-' is a prefix used to mean 'relating to the environment'.
  • The prefixes 'in-', 'im-', 'il-' and 'ir-' all mean 'not'.

Grammar

(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)