cinque (n.)

"a group of five, five units treated as one," especially at cards or dice, late 14c., from French cinq, dissimilated from Latin quinque "five," in Late Latin also cinque (from PIE root *penkwe- "five").

The Cinque Ports (late 12c. in Anglo-Latin, late 13c. in English) were Hastings, Sandwich, Dover, Romney, and Hythe, granted special privileges from the crown in return for defense of the Channel in the days before England had a navy. Cinque outposts (1640s) was an old term for the five senses.