|1.||[ noun ] (immunology) the attraction between an antigen and an antibody|
|Related terms:||attraction immunology|
|2.||[ noun ] inherent resemblance between persons or things|
|3.||[ noun ] (physics) the force attracting atoms to each other and binding them together in a molecule|
: "basic dyes have an affinity for wool and silk"
|4.||[ noun ] 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"
|Related terms:||relation sympathy rapport|
|5.||[ noun ] (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"
|Related terms:||kinship biology|
|6.||[ noun ] kinship by marriage or adoption; not a blood relationship|
|Related terms:||consanguinity kinship steprelationship|
|7.||[ noun ] a natural attraction or feeling of kinship|
: "an affinity for politics" "the mysterious affinity between them" "James's affinity with Sam"