1828 dictionary Noah Webster's 1828 American Dictionary 1828 webster
Noah Webster's 1828 American Dictionary
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H  ›  heptagonal
H  ›  heptagonal
1828 Definition

HEPTAG'ONAL, a. Having seven angles or sides. Heptagonal numbers, in arithmetic, a sort of polygonal numbers, wherein the difference of the terms of the corresponding arithmetical progression is 5. One of the properties of these numbers is, that if they are multiplied by 40, and 9 is added to the product, the sum will be a square number.

1913 Definition
Heptagonal (heptagonal)
a.(?)
Hep*tag"o*nal
[Cf. F. heptagonal.]
  1. Having seven angles or sides.

    Heptagonal numbers (Arith.), the numbers of the series 1, 7, 18, 34, 55, etc., being figurate numbers formed by adding successively the terms of the arithmetical series 1, 6, 11, 16, 21, etc.


1828 dictionary
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It is not only important, but, in a degree necessary, that the people of this country, should have an American Dictionary of the English language; for, although the body of the language is the same as in England, and it is desirable to perpetuate that sameness, yet some differences must exist. Language is the expression of ideas; and if the people of one country cannot preserve an identity of ideas, they cannot retain an identity of language.
  




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