Definition of king-size
1
: longer than the regular or standard size
a king-size cigarette
2
: unusually large
3
US, of a bed
: having dimensions of approximately 76 by 80 inches (about 1.9 by 2.0 meters)
also
: of a size that fits a king-size bed
king-size sheets
— compare full-size, queen-size, twin-size
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Merriam-Webster unabridged
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Time Traveler for king-size
The first known use of king-size was in 1909
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