Associated Words: septenary, septuple, septette, septenate, septemvirate, septemvir, heptarchy.
"Putnam's Word Book" by Louis A. Flemming
Now, as I have said, our puzzle may be solved at once by merely converting 1,000,000 dollars to the septenary scale.
"Amusements in Mathematics" by Henry Ernest Dudeney
It is septenary in constitution, as may be seen in its vibrations expressed in color and sound.
"Elementary Theosophy" by L. W. Rogers
The Egyptians made use of a septenary system in the arrangement of the grand gallery in the center of the great pyramid.
"Vestiges of the Mayas" by Augustus Le Plongeon