absence (n.) Look up absence at Dictionary.com
"state of not being present," late 14c., from Old French absence "absence" (14c.), from Latin absentia, abstract noun from absentem (nominative absens), present participle of abesse "be away from, be absent," from ab- "away" (see ab-) + esse "to be," from PIE root *es- "to be" (see essence). Absence makes the heart grow fonder is a line from the song "Isle of Beauty" by English poet and composer Thomas Haynes Bayly (1797-1839).