1. a likeness in regards to construction, shape, or value. 2. unions of marriage or legal adoptive processes rather than by genetic markers. 3. with regard to pharmacologic medicine, the propensity of a certain ligand to tie itself to another certain receptor, gauged by the amount of receptors the ligand uses. 4. an inheritable or innate draw toward someone, some place, or some thing, frequently due to similar or shared traits.
AFFINITY: "Nick's affinity toward Alyssa was obvious to all that knew the pair."