Etymology
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pentad (n.)

"set of five things considered together," 1650s, from Greek pentas (genitive pentados) "the number five, a group of five," from PIE root *penkwe- "five." Meaning "period of five years" is from 1880; meaning "period of five days" is from 1906, originally in meteorology.

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Definitions of pentad

pentad (n.)
the cardinal number that is the sum of four and one;
Synonyms: five / " / v / cinque / quint / quintet / fivesome / quintuplet / fin / Phoebe / Little Phoebe
From wordnet.princeton.edu