when you experience no difficulty, effort, pain, etcShe won the 400m race with ease.
The doors are extra-wide for ease of access (= so that people can get in without difficulty).
at (your) ease relaxedHe felt completely at ease.
She soon put/set me at ease (= made me relaxed) .
at ease (also standing at ease) If someone, especially a soldier, is at ease, they are standing with their feet apart and their hands behind their back.