Affinity, in etymology affinity's the opposite of infinity . These two words have the same root coming from the Latin: finis = end. “Affinity” meaning's near to the “finis” for example close to the “zero point” in a before assumed space. On the other hand, from the Latin, affinis = connected with, having things in common, and it's utilised to interpret the effective possibility that some substances can or can't mix together, in terms of sympathies and antipat… (More on Affinity)