ə fI nih ti
noun
1. a strong sense of liking; a natural attraction or sympathy.
The two women felt an immediate affinity for each other.
2. a close resemblance; likeness in certain characteristics.
There is a strong affinity between the Swedish and Norwegian languages.
3. a relationship by marriage.
4. a similarity between biological species that suggests a common origin.
5. a chemical attraction or force that causes certain elements to combine with certain others.