subtraction

n. mathematical function in which one number is deducted from another (represented by the sign - ); deduction, act of taking away part of a whole

Subtraction is one of the four basic arithmetic operations; it is the inverse of addition. Subtraction is denoted by a minus sign in infix notation.The traditional names for the parts of the formulac − b = a are minuend (c) − subtrahend (b) = difference (a). The words "minuend" and "subtrahend" are uncommon in modern usage. However, "difference" is very common.Subtraction is used to model several closely related processes, although substraction does the opposite:From a given collection, take away (subtract) a given number of objects.Combine a given measurement with an opposite measurement, such as, a movement right followed by a movement left, or a deposit and a withdrawal.Compare two objects to find their difference. For example, the difference between $800 and $600 is $800 − $600 = $200.
See more at Wikipedia.org...

Noun
1. an arithmetic operation in which the difference between two numbers is calculated; "the subtraction of three from four leaves one"; "four minus three equals one"
(synonym) minus
(hypernym) arithmetic operation
(derivation) subtract, deduct, take off
2. the act of subtracting (removing a part from the whole); "he complained about the subtraction of money from their paychecks"
(synonym) deduction
(antonym) addition
(hypernym) decrease, diminution, reduction, step-down
(hyponym) bite
(derivation) subtract, deduct, take off

(n.)
The withdrawing or withholding from a person of some right to which he is entitled by law.
  

(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 act or operation of subtracting or taking away a part.
  

Synonyms and related words:
abatement, abridgment, absence, abstraction, addition, alienation, alleviation, approximation, attenuation, awayness, blank, contraction, dampening, damping, decrease, decrement, decrescence, deduction, deflation, depreciation, depression, deprivation, detachment, differentiation, diminishment, diminution, disarticulation, disassociation, disconnectedness, disconnection, discontinuity, discount, disengagement, disjointing, disjunction, dislocation, disunion, division, divorce, divorcement, dying, dying off, equation, evolution, extenuation, extrapolation, fade-out, incoherence, integration, interpolation, inversion, involution, isolation, lack, languishment, lessening, letup, lowering, luxation, miniaturization, mitigation, multiplication, neverness, nonexistence, nonoccurrence, nonpresence, notation, nowhereness, parting, partition, practice, proportion, rebate, reduction, relaxation, removal, sagging, scaling down, segmentation, separation, separatism, simplicity, subdivision, transformation, want, weakening, withdrawal, zoning