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subtraction 音标拼音: [səbtr'ækʃən] n. 减去,减法 减去,减法 subtraction减法 subtraction减法 subtraction n 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: { subtraction}, { minus}] 2: the act of subtracting ( removing a part from the whole); " he complained about the subtraction of money from their paychecks" [ synonym: { subtraction}, { deduction}] [ ant: { addition}] Compound \ Com" pound\, a. [ OE. compouned, p. p. of compounen. See { Compound}, v. t.] Composed of two or more elements, ingredients, parts; produced by the union of several ingredients, parts, or things; composite; as, a compound word. [ 1913 Webster] Compound substances are made up of two or more simple substances. -- I. Watts. [ 1913 Webster] { Compound addition}, { subtraction}, { multiplication}, { division} ( Arith.), the addition, subtraction, etc., of compound numbers. { Compound crystal} ( Crystallog.), a twin crystal, or one seeming to be made up of two or more crystals combined according to regular laws of composition. { Compound engine} ( Mech.), a form of steam engine in which the steam that has been used in a high- pressure cylinder is made to do further service in a larger low- pressure cylinder, sometimes in several larger cylinders, successively. { Compound ether}. ( Chem.) See under { Ether}. { Compound flower} ( Bot.), a flower head resembling a single flower, but really composed of several florets inclosed in a common calyxlike involucre, as the sunflower or dandelion. { Compound fraction}. ( Math.) See { Fraction}. { Compound fracture}. See { Fracture}. { Compound householder}, a householder who compounds or arranges with his landlord that his rates shall be included in his rents. [ Eng.] { Compound interest}. See { Interest}. { Compound larceny}. ( Law) See { Larceny}. { Compound leaf} ( Bot.), a leaf having two or more separate blades or leaflets on a common leafstalk. { Compound microscope}. See { Microscope}. { Compound motion}. See { Motion}. { Compound number} ( Math.), one constructed according to a varying scale of denomination; as, 3 cwt., 1 qr., 5 lb.; -- called also { denominate number}. { Compound pier} ( Arch.), a clustered column. { Compound quantity} ( Alg.), a quantity composed of two or more simple quantities or terms, connected by the sign ( plus) or - ( minus). Thus, a b - c, and bb - b, are compound quantities. { Compound radical}. ( Chem.) See { Radical}. { Compound ratio} ( Math.), the product of two or more ratios; thus ab: cd is a ratio compounded of the simple ratios a: c and b: d. { Compound rest} ( Mech.), the tool carriage of an engine lathe. { Compound screw} ( Mech.), a screw having on the same axis two or more screws with different pitch ( a differential screw), or running in different directions ( a right and left screw). { Compound time} ( Mus.), that in which two or more simple measures are combined in one; as, 6- 8 time is the joining of two measures of 3- 8 time. { Compound word}, a word composed of two or more words; specifically, two or more words joined together by a hyphen. [ 1913 Webster]
Subtraction \ Sub* trac" tion\, n. [ L. subtractio a drawing back. See { Subtract}, and cf. { Substraction}.] 1. The act or operation of subtracting or taking away a part. [ 1913 Webster] 2. ( Math.) 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. [ 1913 Webster] 3. ( Law) The withdrawing or withholding from a person of some right to which he is entitled by law. [ 1913 Webster] Note: Thus the subtraction of conjugal rights is when either the husband or wife withdraws from the other and lives separate without sufficient reason. The subtraction of a legacy is the withholding or detailing of it from the legatee by the executor. In like manner, the withholding of any service, rent, duty, or custom, is a subtraction, for which the law gives a remedy. -- Blackstone. [ 1913 Webster] 88 Moby Thesaurus words for " subtraction": 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
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