affinity

noun

1. (immunology) the attraction between an antigen and an antibody

   noun.phenomenon

   Source: WordNet 3.0

2. (anthropology) kinship by marriage or adoption; not a blood relationship

   noun.linkdef

   Antonyms blood kinship cognation consanguinity

   Source: WordNet 3.0

3. (biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts

   noun.linkdef

   Examples

   In anatomical structure prehistoric man shows close affinity with modern humans.

   Synonyms phylogenetic relation

   Source: WordNet 3.0

4. a close connection marked by community of interests or similarity in nature or character

   noun.linkdef

   Examples

   Found a natural affinity with the immigrants.

   Synonyms kinship

   Source: WordNet 3.0

5. the force attracting atoms to each other and binding them together in a molecule

   noun.phenomenon

   Examples

   Basic dyes have an affinity for wool and silk.

   Synonyms chemical attraction

   Source: WordNet 3.0

6. inherent resemblance between persons or things

   noun.attribute

   Source: WordNet 3.0

7. a natural attraction or feeling of kinship

   noun.attribute

   Examples

   An affinity for politics.

   The mysterious affinity between them.

   James's affinity with Sam.

   Source: WordNet 3.0

8. Relationship by marriage (as between a husband and his wife's blood relations, or between a wife and her husband's blood relations); -- in contradistinction to <i>consanguinity</i>, or relationship by blood; -- followed by <i>with</i>, <i>to</i>, or <i>between</i>.

   noun

   Source: webster1913