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Progression :: Progression (n.) Regular or proportional advance in increase or decrease of numbers; continued proportion, arithmetical, geometrical, or harmonic..

Arithmetical :: Arithmetical (a.) Of or pertaining to arithmetic; according to the rules or method of arithmetic.

Series :: Series (n.) An indefinite number of terms succeeding one another, each of which is derived from one or more of the preceding by a fixed law, called the law of the series; as, an arithmetical series; a geometrical series..

Subdued :: Subduction (n.) Arithmetical subtraction.

Real :: Real (a.) Having an assignable arithmetical or numerical value or meaning; not imaginary.

Arithmetically :: Arithmetically (adv.) Conformably to the principles or methods of arithmetic.

Add :: Add (v. i.) To perform the arithmetical operation of addition; as, he adds rapidly..

Logarithmetically :: Logarithmetically (adv.) Logarithmically.

Divide :: Divide (v. t.) To subject to arithmetical division.

Average :: Average (n.) A mean proportion, medial sum or quantity, made out of unequal sums or quantities; an arithmetical mean. Thus, if A loses 5 dollars, B 9, and C 16, the sum is 30, and the average 10..

Logarithm :: Logarithm (n.) One of a class of auxiliary numbers, devised by John Napier, of Merchiston, Scotland (1550-1617), to abridge arithmetical calculations, by the use of addition and subtraction in place of multiplication and division..

Equidifferent :: Equidifferent (a.) Having equal differences; as, the terms of arithmetical progression are equidifferent..

Abacus :: Abacus (n.) A calculating table or frame; an instrument for performing arithmetical calculations by balls sliding on wires, or counters in grooves, the lowest line representing units, the second line, tens, etc. It is still employed in China..

Quipu :: Quipu (n.) A contrivance employed by the ancient Peruvians, Mexicans, etc., as a substitute for writing and figures, consisting of a main cord, from which hung at certain distances smaller cords of various colors, each having a special meaning, as silver, gold, corn, soldiers. etc. Single, double, and triple knots were tied in the smaller cords, representing definite numbers. It was chiefly used for arithmetical purposes, and to register important facts and events..

Proportion :: Proportion (n.) The equality or similarity of ratios, especially of geometrical ratios; or a relation among quantities such that the quotient of the first divided by the second is equal to that of the third divided by the fourth; -- called also geometrical proportion, in distinction from arithmetical proportion, or that in which the difference of the first and second is equal to the difference of the third and fourth..

Naught :: Naught (adv.) The arithmetical character 0; a cipher. See Cipher.

Rabdology :: Rabdology (n.) The method or art of performing arithmetical operations by means of Napier's bones. See Napier's bones.

Sexenary :: Sexenary (a.) Proceeding by sixes; sextuple; -- applied especially to a system of arithmetical computation in which the base is six.

Subduction :: Subduct (v. t.) To subtract by arithmetical operation; to deduct.

Logarithmetical :: Logarithmetical (a.) See Logarithmic.

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