pentad

American  

[pen-tad] / ˈpɛn tæd /

noun

1. a period of five years.

2. a group of five.

3. the number five.

4. Chemistry. a pentavalent element or group.

5. Climatology. a period of five consecutive days.

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pentad British  

/ ˈpɛntæd /

noun

1. a group or series of five

2. the number or sum of five

3. a period of five years

4. chem a pentavalent element, atom, or radical

5. meteorol a period of five days

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Etymology

Origin of pentad

First recorded in 1645–55; from Greek pentad- (stem of pentás ) group of five; see origin at pent-, -ad ¹

Example Sentences

See Examples For:

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

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 Henry Nelson Coleridge

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 Rufus Phillips Williams

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

The word pentad at once recalls to you the way in which the chemist speaks of a monad, triad, heptad, when he deals with elements.

From An Introduction to Yoga by Annie Wood Besant