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

air mattress

noun
1.
a mattress, usually of plastic or rubber, that can be inflated for use, as in camping, and deflated for storage.
Origin of air mattress
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Value for air

3
3
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