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 Dio, Cassius

An element having a valence of one is a monad; of two, a dyad; three, a triad; four, tetrad; five, pentad; six, hexad, etc.

From An Introduction to Chemical Science by Williams, Rufus Phillips

All things in which the temporal is concerned may be reduced to a pentad, namely, prothesis, thesis, antithesis, mesothesis and synthesis.

From The Literary Remains of Samuel Taylor Coleridge by Coleridge, Henry Nelson

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 Coleridge, Henry Nelson