affinity

(n) (immunology) the attraction between an antigen and an antibody
(n) (anthropology) kinship by marriage or adoption; not a blood relationship
(n) (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
phylogenetic relation,
(n) 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
kinship,
(n) the force attracting atoms to each other and binding them together in a molecule
- basic dyes have an affinity for wool and silk
chemical attraction,
(n) inherent resemblance between persons or things
(n) a natural attraction or feeling of kinship
- an affinity for politics
- the mysterious affinity between them
- James's affinity with Sam