1. In comfort; without pain or bother.
You can't feel at ease with a toothache.
2. or at one's ease
Comfortable in one's mind; relaxed, not troubled. — Often used in the phrase "put at ease" or "put at one's ease."
We put Mary at her ease during the thunderstorm by reading her stories.
Compare: AT HOME (2).
3. Standing with your right foot in place and without talking in military ranks.
The sergeant gave his men the command "At ease!"
Compare: PARADE REST.