- large or immense, as a wave.
- (in ancient Rome) of or relating to the tenth cohort of a legion.
- Also called decuman gate. (in ancient Rome) the main gate of a military camp, facing away from the enemy and near which the tenth cohort of the legion was usually stationed.
Origin of decuman
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018