septimal

[ sep-tuh-muhl ]

adjective

1. of or based on the number seven.

Word History and Origins

Origin of septimal¹

1850–55; < Latin septim ( us ) seventh (derivative of septem seven ) + -al ¹

Example Sentences

The number seven, therefore, must be foisted in wherever possible, and among other things, is to be made the basis of numeration, which is hereafter to be septimal instead of decimal: producing all the inconvenience of a change of system, not only without getting rid of, but greatly aggravating, the disadvantages of the existing one.

From Project Gutenberg

Periodicity is governed by the Septimal Law or Law of Sevens, which seems to be the basic law governing the vibratory activities of the planetary universe.

From Project Gutenberg