c. 1200, from Old English æmettig "at leisure, not occupied; unmarried," also "containing nothing, unoccupied," from æmetta "leisure." Watkins explains it as from Proto-Germanic *e-mot-ja-, with a prefix of uncertain meaning + Germanic *mot- "ability, leisure," possibly from PIE root *med- "take appropriate measures."
A sense evolution from "at leisure" to "containing nothing, unoccupied" is found in several languages, such as Modern Greek adeios "empty," originally "freedom from fear," from deios "fear." "The adj. adeios must have been applied first to persons who enjoyed freedom from duties, leisure, and so were unoccupied, whence it was extended to objects that were unoccupied" [Buck]. The -p- is a euphonic insertion. Related: Emptier. Figurative sense of empty-nester attested by 1960.
"an empty thing" that was or is expected to be full, 1865, from empty (adj.). At first of barges, freight cars, mail pouches.
1520s, from empty (adj.); replacing Middle English empten, from Old English geæmtigian. Related: Emptied; emptying.
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