1 : (count, noncount) : a seasoned sauce that is used to add flavor to other foods and that is made of chopped fruit or vegetables
mango relish
especially : such a sauce made from pickles
I like to eat hot dogs with mustard and relish.
2 a : (noncount) : enjoyment of or delight in something
She plays the role with great relish.
He took particular relish in pointing out my error.
2 b : (singular) : a feeling of liking something
He showed little relish for the job. (=he did not like the job)