Definitions

1. adjective

relating to or resembling the Roman numeral system using letters from I to X, and then using the letters X, L, C, D, C, M, and subtracting values as you go from right to left.

“The vicesimal system was used by the ancient Romans to record large numbers.”

2. noun

a numeral or number expressed in the vicesimal system.

“The vicesimal number for four is IV.”