[dek-yoo-muh
n] 
| 1. | large or immense, as a wave. |
| 2. | (in ancient Rome) of or pertaining to the tenth cohort of a legion. |
| 3. | 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. |