affinity
af-fin-i-ty
noun
A close relationship, connection, or resemblance between things.
"There's a clear affinity between the two musical styles."
noun
A natural liking or attraction towards someone or something.
"She felt an immediate affinity for the new colleague."
noun
The spontaneous tendency of atoms or molecules to combine.
"The enzyme showed high affinity for its substrate."
Thesaurus
Synonyms: phylogenetic relation, chemical attraction, kinship
Antonyms: blood kinship, cognation, consanguinity