Definition of full-size
1
: having the usual or normal size of its kind
a full-size keyboard
2
US, of a bed
: having the dimensions 54 by 75 inches (about 1.4 by 1.9 meters)
also
: of a size to fit a full-size bed
full-size sheets
— compare king-size, queen-size, twin-size
3
US, of a vehicle
: relatively large in size
especially, of a sedan
: having four doors and seating for up to six
Not too long ago, everyone, and we mean everyone, from Elvis to your Aunt Bea drove a big, powerful full-size American car. … — Scott Oldham
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Merriam-Webster unabridged
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Time Traveler for full-size
The first known use of full-size was in 1772
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