Meaning of pentad

pen•tad

Pronunciation: (pen'tad), [key]
— n.
  1. a period of five years.
  2. a group of five.
  3. the number five.
  4. a pentavalent element or group.
  5. a period of five consecutive days.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: