Strong's #139: hairesis (pronounced hah'-ee-res-is)

from 138; properly, a choice, i.e. (specially) a party or (abstractly) disunion:--heresy (which is the Greek word itself), sect.

Thayer's Greek Lexicon:

̔́

hairesis

1) act of taking, capture: e.g. storming a city

2) choosing, choice

3) that which is chosen

4) a body of men following their own tenets (sect or party)

4a) of the Sadducees

4b) of the Pharisees

4c) of the Christians

5) dissensions arising from diversity of opinions and aims

Part of Speech: noun feminine

Relation: from G138

Citing in TDNT: 1:180, 27

Usage:

This word is used 9 times:

 

Acts 5:17: "that were with him, (which is the sect of the Sadducees,) and were filled with indignation,"
Acts 15:5: "certain of the sect of the Pharisees which believed, saying,"
Acts 24:5: "and a ringleader of the sect of the Nazarenes:"
Acts 24:14: "way which they call heresy, so worship I the God of my fathers,"
Acts 26:5: "after the most straitest sect of our religion I lived a Pharisee."
Acts 28:22: "as concerning this sect, we know that"
1 Corinthians 11:19: "there must be also heresies among you, that they which are approved"
Galatians 5:20: "wrath, strife, seditions, heresies,"
2 Peter 2:1: "who privily shall bring in damnable heresies, even denying the Lord"