Learner's definition of MUTUAL
1 : shared between two or more people or groups
Mutual love and respect was the key to their successful marriage.
The partnership was based on mutual admiration and understanding.
countries relying on mutual support during difficult times
◊ If a feeling is mutual, then two people or groups feel the same way about each other.
Her fans love her, and the feeling is mutual. [=and she loves her fans]
Their attraction was mutual. [=they were both attracted to each other]
“I'm pleased to meet you.” “The feeling is mutual!” [=I'm also pleased to meet you]
2 always used before a noun : shared by two or more people or groups
They met through a mutual friend. [=a person who was a friend of both of them]
our mutual hobby of car racing
The two countries have several mutual [=joint] interests.
It was a mutual effort.
We had a mutual agreement not to tell our secret.