[on-see-zuh
n, awn-] 
| 1. | being a time of year that is the busiest or most popular for a specific activity; in season: on-season airfares. |
| 2. | in or during the busiest season: to travel on-season. |
| 3. | a time of year that is the busiest or most popular for a specific activity: We stayed at the resort in the on-season. |