STRONGS NT 615: ἀποκτείνω

ἀποκτείνω, and Aeolic, ἀποκτέννω (Matthew 10:28 L T Tr; Mark 12:5 G L T Tr; Luke 12:4 L T Tr; 2 Corinthians 3:6 T Tr; cf. Fritzsche on Mark, p. 507f; (Tdf. Proleg., p. 79); Winers Grammar, 83 (79); (Buttmann, 61 (54))), ἀποκτενῶ (Griesbach in Matthew 10:28; Luke 12:4), ἀποκταίνω (Lachmann in 2 Corinthians 3:6; Revelation 13:10), ἀποκτεννυντες (Mark 12:5 WH); future ἀποκτενῶ; 1 aorist ἀπέκτεινα; passive, present infinitive ἀποκτέννεσθαι (Revelation 6:11 G L T Tr WH); 1 aorist ἀπεκτάνθην (Alexander Buttmann (1873) Ausf. Spr. ii. 227; Winers Grammar, the passage cited; (Buttmann, 41 (35f))); (from Homer down);

1. properly, to kill in any way whatever (ἀπό i. e. so as to put out of the way; cf. (English to kill off), German abschlachten): Matthew 16:21; Matthew 22:6; Mark 6:19; Mark 9:31; John 5:18; John 8:22; Acts 3:15; Revelation 2:13, and very often; (ἀποκτενῶ ἐν θανάτῳ, Revelation 2:23; Revelation 6:8, cf. Buttmann, 184 (159); Winers Grammar, 339 (319)). to destroy (allow to perish): Mark 3:4 (yet others take it here absolutely, to kill).

2. metaphorically, to extinguish, abolish: τήν ἐχτραν, Ephesians 2:16; to inflict moral death, Romans 7:11 (see ἀποθνῄσκω, II. 2); to deprive of spiritual life and procure eternal misery, 2 Corinthians 3:6 (Lachmann ἀποκταινει; see above).