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

reduced mass

noun, Mechanics
1.
a quantity obtained when one particle is moving about another, larger particle that is also moving, equivalent to the mass of the smaller particle, were the larger particle not moving, and equal to the quotient of the product of the two masses divided by their sum.
Origin of reduced mass
1930-1935
1930-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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11
13
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