prefix

Fetched 2026-10-27 (live).

Synonyms: refix, premix

Antonyms: refix, premix

Related words from Datamuse; suggestions, not definitions.

Noun

1. Something placed before another A morpheme added to the beginning of a word to modify its meaning, for example as, pre- in prefix, con- in conjure, re- in reheat, etc.
   • in the UK, a number with an 0800 prefix is a toll-free number.
   • Add the prefix +34 to dial a Spanish number from abroad
   • The string "abra" is both a prefix and a suffix of the string "abracadabra".
2. A morpheme added to the beginning of a word to modify its meaning, for example as, pre- in prefix, con- in conjure, re- in reheat, etc.
3. A set of digits placed before a telephone number, to indicate where the number is based, what type of phone number it is (landline, mobile, toll-free, premium rate etc.)
   • in the UK, a number with an 0800 prefix is a toll-free number.
   • Add the prefix +34 to dial a Spanish number from abroad
4. A title added to a person's name, such as Mr. or Dr.
5. An initial segment of a string of characters.
   • The string "abra" is both a prefix and a suffix of the string "abracadabra".

Verb

1. To determine beforehand; to set in advance. .mw-parser-output .defdate{font-size:smaller}
   • They duly arrived at the prefixed hour.
2. To put or fix before, or at the beginning of something; to place at the start.
   • His requests for money were usually prefixed by an apology.
   • You must prefix the number with the area code.

Source: Wiktionary · CC BY-SA 3.0 (Wiktionary) · cached copy, not a rewrite.