Yours, Etc.: Origins and Uses of 8 Sign-Offs
late 14c., from Old French absence (14c.), from Latin absentia, noun of state from absentem (nominative absens), present participle of abesse "be away from, be absent," from ab- "away" (see ab-) + esse "to be" (see essence).
Absence makes the heart grow fonder
[Thomas Haynes Bayly (1797-1839) "Isle of Beauty"]
absence ab·sence (āb'səns)
See petit mal.