"affinity" in the noun sense
1. affinity
immunology) the attraction between an antigen and an antibody
2. affinity
anthropology) kinship by marriage or adoption not a blood relationship
3. affinity, phylogenetic relation
biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts
"in anatomical structure prehistoric man shows close affinity with modern humans"
4. affinity, kinship
a close connection marked by community of interests or similarity in nature or character
"found a natural affinity with the immigrants"
"felt a deep kinship with the other students"
"anthropology's kinship with the humanities"
5. affinity, chemical attraction
the force attracting atoms to each other and binding them together in a molecule
"basic dyes have an affinity for wool and silk"
6. affinity
inherent resemblance between persons or things
7. affinity
a natural attraction or feeling of kinship
"an affinity for politics"
"the mysterious affinity between them"
"James's affinity with Sam"
Source: WordNet® (An amazing lexical database of English)
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