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What do a.m. and p.m. stand for?

upper deck

noun, Nautical
1.
the uppermost continuous deck that is capable of being made watertight; freeboard deck.
Origin of upper deck
1585-1595
1585-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Value for upper

9
12
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