Limerence is basically a word coined in 1979 by American psychologist Dorothy Tennov. It's a very obscure term, even among psychologists. In fact Tennov's followers in 2010 remarked how few professional clinical psychologists even were aware of the concept. Nevertheless the Wikipedia article on it is about 3300 words long. The word basically means a crush/infatuation with someone that is often unrequited and obsessive.
Whenever I look up the word, its etymology is usually given as:
coined by Dorothy Tennov (1928–2007), American psychologist
This doesn't help that much.
Wiktionary gives the etymology of:
From arbitrary first element + -ence.
This makes no sense to me. The website Wordnik gives an etymology, which purportedly is sourced from Wiktionary, and says:
The coinages are arbitrary; there is no specific etymology.
This has me confused, as I don't understand what these mean.