1. the acts of joining or signing up for military service
2. the periods of time for which someone serves in the military after enlisting

Examples

• Military enlistments increased during wartime.
• The recruiting office processed dozens of enlistments each month.
• His two enlistments in the Navy totaled eight years of service.
• Voluntary enlistments rose after the attack on the homeland.
• The sergeant reviewed the new enlistments with the commanding officer.
• Extended enlistments often come with signing bonuses.
• Many enlistments occur right after high school graduation.