BT Ket 10b(43) :מי הואי אלא דעתידה הכא נמי דעתידה‏ : was (GN) in existence? Rather it will (be) in the future. In this case also [i.e. concerning the ketubbah of a widow], it will (be) in the future
See the entire entry for ˁṯīḏ/ˁattīḏ adj. prepared, future