pen·tad 
(pĕntăd′)
(pĕntăd′)n.
A group of five.
[Greek pentas, pentad-, group of five, from pente, five; see penkwe in the Appendix of Indo-European roots.]
- Timbuktu
- time
- time after time
- time and again
- time and a half
- time and motion study
- time bomb
- time capsule
- timecard
- time clock
- time-consuming
- time deposit
- time dilation
- time draft
- timed-release
- time exposure
- time frame
- timeframe
- time-honored
- time immemorial
- timekeeper
- timekeeping
- time-lapse
- timeless
- timelessly