the mind > emotion > love > amorous love > [noun] > letter sent between lovers > call or note as means of amorous communication (2)
(a) a call or other expression of emotion used by one lover to another; (b) a cry or sound made by an animal during courtship or in order to…
(a) a musical note in a love song (chiefly in plural); (also) an animal's love call; (b) a written note expressing love, a brief love letter.