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Prefix has meanings in linguistics, mathematics and computer science, and telecommunications.

Contents 1 Linguistics 1.1 See also 2 Mathematics and computer science: Prefix operator 3 Computer science: Strings 4 Telephone prefixes 5 See also

Linguistics

In linguistics, a prefix is a type of affix that precedes the morphemes to which it can attach. Prefixes are bound morphemes (they cannot occur as independent words).

While most languages employ both prefixes and suffixes, prefixes are crosslinguistically less common. Some languages employ mostly suffixes and almost no prefixes at all.

The use of prefixes has been found to correlate statistically with other linguistic features, such as a verb-object word order and the use of prepositions.

In the Indo-European languages, prefixes are mostly derivational morphemes (inflection is most often marked with suffixes).

See also

• Clitic
• Pre-nominal letters
• List of prefixes in the English language
• List of Latin words with English derivatives
• SI prefix
• Binary prefix
• Numerical prefix
• Unpaired word

Mathematics and computer science: Prefix operator

In the syntax of notations used in mathematics and computer science, prefix is used to describe an operator such as the usual addition sign + that is taken to bind to the variables succeeding them. See operator for more on the placement of operators.

• prefix : prefix notation Polish notation
• postfix : postfix notation reverse Polish notation
• infix : infix notation

Computer science: Strings

A prefix of a string is a string such that , where .

T = BANANA
    |||
P = BAN

Telephone prefixes

A telephone prefix is the first set of digits of telephone number; in the North American Numbering Plan countries (country code 1), it is the first three digits out of a seven-digit phone number. It shows which exchange the remaining numbers refer to. For example: abc-defg (with actual numbers) might refer to Anytown while cab-defg could refer to Anycity.

Some places restrict certain prefixes to only fax numbers or for cell phones while in other places the prefixes are all jumbled up.

Most (but not all) area codes reserve the prefix 555 for special uses (555-1212 is telephone information in most area codes.) For this reason, it is often used for phone numbers in television and movies. Failure to do so in the film Bruce Almighty resulted in someone's real phone number being used, eventually leading to a lawsuit.

See also: area code

See also

• infix
• suffix
• substring

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