Word:

Figurate numbers

(Math.) numbers, or series of numbers, formed from any arithmetical progression in which the first term is a unit, and the difference a whole number, by taking the first term, and the sums of the first two, first three, first four, etc., as the successive terms of a new series, from which another may be formed in the same manner, and so on, the numbers in the resulting series being such that points representing them are capable of symmetrical arrangement in different geometrical figures, as triangles, squares, pentagons, etc.

See also: Figurate

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Fightwite
FIGLET
Figment
Figpecker
Figs
Figulate
Figuline
Figurability
Figurable
Figural
figural blindness
Figural numbers
Figurant
Figurante
Figurate
Figurate counterpoint
-- Figurate numbers --
Figurated
Figurately
Figuration
Figurative
Figurative counterpoint
figuratively
Figure
Figure caster
figure eight
Figure flinging
figure loom
figure of eight
figure of speech
figure out
Figure painting
figure skate
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