This article is from the alt.usage.english FAQ, by Mark Israel firstname.lastname@example.org with numerous contributions by others.
The meaning of "limerence" falls somewhere between "infatuation"
and "romantic love". It was coined circa 1977 by Dorothy Tennov,
then professor of psychology at the University of Bridgeport,
Connecticut. It was an arbitrary coinage; there is no specific
etymology. For further information on limerence see her book
"Love and Limerence" (Stein and Day, 1979); or you may e-mail her
directly at "email@example.com".