Jisho

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Noun
1. reserved word; keywordComputing
Wikipedia definition
2. Reserved wordReserved words are one type of grammatical construct in programming languages. These words have special meaning within the language and are predefined in the language’s formal specifications. Typically, reserved words include labels for primitive data types in languages that support a type system, and identify programming constructs such as loops, blocks, conditionals, and branches. The list of reserved words in a language are defined when a language is developed.
Read “Reserved word” on English Wikipedia
Read “予約語” on Japanese Wikipedia
Read “Reserved word” on DBpedia

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