Excerpt - page 1588: "... of seven associated by common properties or behavior. [ From SEPTUPLE (modeled on TRIPLET). sep•ul•eher (sep'al-kar) n. 1. A burial vault. ..."
Excerpt - page 514: "... five-part or quintuple time, six-part or sextuple time, seven-part or septuple time, nine- part or nonuple time; two-four time, six-eight time, ..."