Definitions of affinity:

  • noun:   a natural attraction or feeling of kinship
    Example: "An affinity for politics"
  • noun:   inherent resemblance between persons or things
  • noun:   the force attracting atoms to each other and binding them together in a molecule
    Example: "Basic dyes have an affinity for wool and silk"
  • noun:   (immunology) the attraction between an antigen and an antibody
  • noun:   a close connection marked by community of interests or similarity in nature or character
    Example: "Found a natural affinity with the immigrants"
  • noun:   (biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts
    Example: "In anatomical structure prehistoric man shows close affinity with modern humans"
  • noun:   kinship by marriage or adoption; not a blood relationship