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Meanings and definitions for QF

Qantas, an airline of Australia (IATA code QF)
Qatar Foundation, a private, chartered, non-profit organization in the state of Qatar
Quality factor, in physics and engineering, a measure of the "quality" of a resonant system
Quick-firing gun, a sort of artillery piece
Quiverfull, a movement of Christians who eschew all forms of birth control
A gun breech that uses metallic cartridges (see British ordnance terms#QF)