Meaning of “ease” - Learner’s Dictionary

ease

noun uk us /iːz/

B2 [ U ] If you do something with ease, it is very easy for you to do it:

Gary passed his exams with ease.
I'm amazed at the ease with which he learnt the language.
at ease

B2 feeling relaxed and comfortable:

I felt completely at ease with him.

(Definition of “ease noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)