From haireomai; properly, a choice, i.e. (specially) a party or (abstractly) disunion -- heresy (which is the Greek word itself), sect.
see GREEK haireomai
1. (from αἱρέω), act of taking, capture: τῆς πόλεως, the storming of a city; in secular authors.
2. (from ἁιρέομαι), choosing, choice, very often in secular writings: the Sept. Leviticus 22:18; 1 Macc. 8:30.
3. that which is chosen, a chosen course of thought and action; hence one's chosen opinion, tenet; according to the context, an opinion varying from the true exposition of the Christian faith (heresy): 2 Peter 2:1 (cf. DeWette at the passage), and in ecclesiastical writings (cf. Sophocles' Lexicon, under the word).
4. a body of men separating themselves from others and following their own tenets (a sect or party): as the Sadducees, Acts 5:17; the Pharisees, Acts 15:5; Acts 26:5; the Christians, Acts 24:5, 14 (in both instances with a suggestion of reproach); 5. dissensions arising from diversity of opinions and aims: Galatians 5:20; 1 Corinthians 11:19. (Cf. Meyer, at the passages cited; B. D. American edition under the word
5. dissensions arising from diversity of opinions and aims: Galatians 5:20; 1 Corinthians 11:19. (Cf. Meyer, at the passages cited; B. D. American edition under the word