Etymology
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septenary (adj.)

"consisting of or relating to seven," c. 1600, from Latin septenarius "consisting of seven," from septeni (plural) "seven apiece, by sevens," from septem "seven" (see seven). Especially in reference to the week. As a noun, "group or set of seven," from 1590s; as "period of seven years," 1570s.

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Definitions of septenary

septenary (n.)
the cardinal number that is the sum of six and one;
Synonyms: seven / " / vii / sevener / heptad / septet
From wordnet.princeton.edu