F1 Definition

abbreviation
F1 hybrid.
Wiktionary
Formula One / Formula 1
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(weather) A rating of F1 on the Fujita scale.
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A computer keyboard key, short for function 1.

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(slang, dated) Help or advice (derived from the common usage of "F1" as the help key, during the DOS era of computing programs)

Wiktionary

Words Near F1 in the Dictionary