Jisho

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Noun
1. function keyComputing
Wikipedia definition
2. Function keyA function key is a key on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions. On some keyboards/computers, function keys may have default actions, accessible on power-on.
Read “Function key” on English Wikipedia
Read “ファンクションキー” on Japanese Wikipedia
Read “Function key” on DBpedia
Other forms
ファンクション・キー

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