septenary

English

From the Latin septēnārius (“consisting of seven each”), from septēnī (“seven each”, “seven at a time”) + -ārius (whence the English suffix -ary).

septenary (not comparable)

Consisting of or containing seven.
Of seventh rank or order.
- 1899 October, W J McGee, The Beginning of Mathematics, in American Anthropologist 1(4), page 657, [1]
  ... indeed if further evidence than that of bestial and savage counting were required to show that finger-numeration and the quinary system were not primeval, it would be afforded by the development of the senary-septenary system in so many lands.
Lasting seven years; continuing seven years.
- Fuller
  Septenary penance.

of seventh rank or order

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