STRONGS G139:
													
												
									    		αἵρεσις, 
-εως, 
ἡ;
1. (from 
αἱρέω), 
act of taking, capture: 
τῆς πόλεως, the storming of a city; in secular authors.
2. (from 
αἱρέομαι), 
choosing, choice, very often in secular writings: 
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); 
Acts 28:22 (in Diogenes Laërtius 1 (13) 18f, others, used of the schools of philosophy).
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 Sects; 
Burton, Bampt. Lect. for 1829; 
Campbell, Diss. on the Gospels, diss. ix., part iv.] 
    THAYER’S GREEK LEXICON, Electronic Database.
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