n. Psychology A state of infatuation or obsesion with another person, usuallty involuntary and characterized by a strong desire for reciprocation of one’s feelings, however not primarily for a sexual relationship.
The word dates to the 1970’s and was coined by Dorothy Tennov. As explained in the following quote, it has no etymology.
“I first used the term ‘amorance’ then changed it back to ‘limerence’… It has no roots whatsoever. It looks nice. It works well in French. Take it from me it has no etymology whatsoever.” – Dorothy Tennov
Usage of the word according to the Google Books Ngram Viewer:
http://www.oxforddictionaries.com/us/definition/american_english/limerence
bumbershoots 