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figurate number

[fig-yer-it] /ˈfɪg yər ɪt/
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.
Origin
1605-1615
1605-15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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12
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