Keyword
1. One of a fixed set of symbols built into the syntax of a language.
Typical keywords would be if, then, else, print, goto, while, switch.
There are usually restrictions about reusing keywords as names for user-defined objects such as variables or procedures.
Languages vary as to what is provided as a keyword and what is a library routine, for example some languages provide keywords for input/output operations whereas in others these are library routines.
2. A small set of words designed to convey the subject of a technical article.
Some publications specify a fixed set of keywords from which those for a particular article should be chosen.
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