Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. The act or process of subtracting; deduction.
 n. Mathematics The arithmetic operation of finding the difference between two quantities or numbers.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. (uncountable) The process of subtracting a number from another.
 n. (countable) A calculation involving subtracting.
 n. The removal of something.
from the GNU version of the Collaborative International Dictionary of English
 adj.
 n. The act or operation of subtracting or taking away a part.
 n. The taking of a lesser number or quantity from a greater of the same kind or denomination; an operation for finding the difference between two numbers or quantities.
 n. The withdrawing or withholding from a person of some right to which he is entitled by law.
from The Century Dictionary and Cyclopedia
 n. The act or operation of subtracting, or taking a part from a whole.
 n. Specifically, in arithmetic and algebra, the taking of one number or quantity from another; the operation of finding the difference between two numbers.
 n. In law, a withdrawing or neglecting, as when a person who owes any suit, duty, custom, or service to another withdraws it or neglects to perform it.
 n. Detraction.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. an arithmetic operation in which the difference between two numbers is calculated
 n. the act of subtracting (removing a part from the whole)
Etymologies
Sorry, no etymologies found.
Examples

He states that although some Mendelians have spoken of genetic factors as permanent and indestructible, he is satisfied that they may occasionally undergo a quantitative disintegration, the results of which he calls subtraction or reduction stages.

I think that practice of subtraction is also what makes it difficult to imagine the framing of Wyeth's paintings.

The most notable subtraction is WR Terrell Owens, who was cut in March.

The best math we could have from Billary is subtraction from the race, NOW.

You go about bullying little boys, and calling yourself King Pewee, but you can't do a sum in long division, nor in short subtraction, for that matter, and you let fellows like Riley make

'Dear Irene and Reggie,' it ran, 'Your dispute as to the number of stomachs which a cow possesses can be settled and rectified by a simple mathematical process usually called subtraction, thus:

The result of the subtraction will be the amount of gas that has been burned since the last bill was rendered.

Thus if a man's capital be ten and his debts eight, the subtraction will be the same, whether we call the capital negative debt, or the debt negative capital.

They WANT bipartisanship but what they offer is a "subtraction" from what Obama wants and an "addition" of NOTHING!!!

In his magisterial recent work, A Secular Age, the Canadian political philosopher Charles Taylor describes the typical assumption of modern European and North American secularists as a story of 'subtraction': take away the unnecessary and dangerous additions that religion has made to ordinary human common sense or rationality, and you will recover the essentially human.
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