Affinity and avidity, while sounding and being spelled quite similarly, are rather different words. "Affinity" denotes a sort of liking or sympathy towards somebody or something. Having an affinity for something means a marked connection. Such a connection is usually spontaneous (not being built up over time as with standard relationships) and the reasons why may or may not be immediately .
clear. "Avidity" is the noun form of the adjective "avid" which describes enthusiasm, zeal or eagerness. In some situations it also connotes a sort of greed, a side effect of the surplus of energy. While the two words are different, they could possibly be used in conjunction; an individual might display avidity towards something for which they have an affinity. More Reference Links: http://www.merriam-webster.com/dictionary/affinity http://www.merriam-webster.com/dictionary/avidity
