eschatology (n.) Look up eschatology at Dictionary.com
1834, from Latinized form of Greek eskhatos "last, furthest, uttermost, extreme, most remote" in time, space, degree, from PIE *eghs-ko-, suffixed form of *eghs "out" (see ex-) + -ology. In theology, the study of the four last things (death, judgment, heaven, hell). Related: Eschatological; eschatologically.
eschaton (n.) Look up eschaton at Dictionary.com
"divinely ordained climax of history," 1935, coined by Protestant theologian Charles Harold Dodd (1884-1973) from Greek eskhaton, neuter of eskhatos "last, furthest, uttermost" (see eschatology).