figurate number

[ fig-yer-it ]

noun

, Mathematics.

1. a number having the property that the same number of equally spaced dots can be arranged in the shape of a regular geometrical figure.

Word History and Origins

Origin of figurate number¹

First recorded in 1605–15

Example Sentences

The number of a rationall figure, is called a Figurate number: And the numbers of which it is made, the Sides of the figurate.

From Project Gutenberg

If the number given be not a quadrate, there shall no arithmeticall side, and to be expressed by a number be found: And this figurate number is but the shadow of a Geometricall figure, and doth not indeede expresse it fully, neither is such a quadrate rationall: Yet notwithstanding the numerall side of the greatest square in such like number may be found: As in 148.

From Project Gutenberg