noun pl. ecstasies -·sies

1. a state of being overpowered by emotion, as by joy, grief, or passion an ecstasy of delight
2. a feeling of overpowering joy; great delight; rapture
3. a trance, esp. one resulting from religious fervor
4. Slang an illegal, mildly psychedelic derivative of amphetamine, CHNO, that slows down reactions and thought; MDMA

Etymology: ME & OFr extasie < LL(Ec) ecstasis < Gr ekstasis, a being put out of its place, distraction, trance < ek-, out + histanai, to set: see stand