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abacus a device used to make arithmetic calculations, consisting of a frame with parallel rods or grooves that hold movable counters such as beads.
accumulator a register or electrical circuit for storing numbers and performing one or more arithmetic or logical operations on them, as in a calculator or computer. [1/3 definitions]
arithmetic a book on the subject of arithmetic. [2/3 definitions]
arithmetician one skilled in arithmetic.
average the arithmetic mean gained by adding two or more quantities and then dividing by the total number of quantities. [4/9 definitions]
average out to amount to an average according to arithmetic calculation (usu. fol. by "to"). [1/2 definitions]
avg. abbreviation of "average," the arithmetic mean gained by adding two or more quantities and then dividing by the total number of quantities.
by in arithmetic, for multiplication of one number times another. [2/16 definitions]
centroid the arithmetic mean of all points that form the boundary of a two- or three-dimensional object.
cipher to solve (a problem) by using arithmetic; calculate. [1/7 definitions]
denominator in arithmetic, the number in a fraction that is below the division line, indicating the number of equal parts into which the number above is to be divided; divisor.
figure (pl.) arithmetic. [1/16 definitions]
mean deviation a measure of variability, esp. in a statistical distribution, that is equal to the average of the absolute values of a set of deviations from the arithmetic mean or some other specified value.
mean distance the arithmetic average of the greatest and least distances of a planet from the sun, used to describe the size of the planet's orbit.
minuend in arithmetic, a number from which another number is subtracted. (Cf. subtrahend.)
multiplication an arithmetic process by which one number is added to itself as many times as the other number indicates. [1/2 definitions]
multiply1 to find the product of (two numbers) by the arithmetic process of multiplication. [2/5 definitions]
number (pl.) arithmetic. [1/18 definitions]
quadrivium in medieval universities, the higher section of the liberal arts, comprising arithmetic, geometry, astronomy, and music. (Cf. trivium.)
quotient that number which is obtained as the result of an arithmetic division.
root mean square the square root of the arithmetic mean of the squares in a given set of numbers.