quintile /kwinˈtīl/

1. Any of four values which divide the items of a frequency distribution into five groups
2. Any of the five groups so formed
3. An aspect of 72º between two heavenly bodies (astrology)

• official birthday
• officialdom
• officialdoms
• officialese
• officialeses
• official family
• officialism
• officialisms
• officialities
• officiality
• official list
• official lists
• officially
• official receiver
• officials
• officialties
• officialty
• officiant
• officiants
• officiate
• officiated
• officiates
• officiating
• officiation
• officiations