From horion; to mark out or bound ("horizon"), i.e. (figuratively) to appoint, decree, specify -- declare, determine, limit, ordain.
see GREEK horion
1. to mark out the boundaries or limits (of any place or thing): Herodotus, Xenophon, Thucydides, others; Numbers 34:6; Joshua 13:27.
2. to determine, appoint: with an accusative of the thing, ἡμέραν, Hebrews 4:7; καιρούς, Acts 17:26 (numerous examples from Greek authors are given in Bleek, Hebrew-Br. 2:1, p. 538f); passive ὡρισμένος, 'determinate,' settled, Acts 2:23; τό ὡρισμένον, that which hath been determined, according to appointment, decree, Luke 22:22; with an accusative of person Acts 17:31 (ᾧ by attraction for ὅν (Winers Grammar, § 24, 1; Buttmann, § 143, 8)); passive with a predicate nominative, Romans 1:4 (for although Christ was the Son of God before his resurrection, yet he was openly appointed (A. V. declared) such among men by this transcendent and crowning event); ὁρίζω, to ordain, determine, appoint, Acts 10:42; followed by an infinitive Acts 11:29 (Sophocles from 19 d. (i. e. Aegeus (539), viii., p. 8, Brunck edition)). (Compare: ἀφορίζω, ἀποδιορίζω, πρωρίζω.)