pentad

In the pentad of 1923-27, U. S. investors paid $34,806,783,000 for 36,965 different issues of bonds and stocks.

From Time Magazine Archive

C. Wachsmuth.—The pentad arrangement in Dio and others.

From Dio's Rome, Volume 1 (of 6) An Historical Narrative Originally Composed in Greek during the Reigns of Septimius Severus, Geta and Caracalla, Macrinus, Elagabalus and Alexander Severus: and Now Presented in English Form by Cassius Dio

Colours may best be expressed by a heptad, the largest possible formula for things finite, as the pentad is the smallest possible form.

From Specimens of the Table Talk of Samuel Taylor Coleridge by Henry Nelson Coleridge

The 'even' in the Sûtra is meant to intimate that the 'five five-people' can in no way mean the twenty-five categories, since there is no pentad of groups consisting of five each.

From The Vedanta-Sutras with the Commentary by Ramanuja — Sacred Books of the East, Volume 48 by George Thibaut

Indeed, the heptad of things finite is in all cases reducible to the pentad.

From Specimens of the Table Talk of Samuel Taylor Coleridge by Henry Nelson Coleridge