Affinity means a natural liking for or attention to something.
Affinity is a noun.
Synonyms: sympathy, tendency, proclivity, propensity, fancy, natural liking, fondness, leaning, partiality, penchant.
Antonyms: aversion, dislike, repulsion, antipathy.
Note: Affinity can also mean a similarity or resemblance.
There is an affinity between Sachin and Sehwag.
I've noticed that Mr.Sai seem to have an affinity for studying hours.
Mr.Naveen has a natural affinity for his twin brother, even though they were separated at birth.