sect

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A group of people forming a distinct unit within a larger group by virtue of certain refinements or distinctions of belief or practice.
2. n. A religious body, especially one that has separated from a larger denomination.
3. n. A faction united by common interests or beliefs.

Century Dictionary and Cyclopedia

1. n. A system or body of doctrines or opinions held by a number of persons and constituting the distinctive doctrines of a school, as propounded originally by the founder or founders of the school and (usually) developed or modified by later adherents; also and usually, the body of persons holding such doctrines or opinions; a school of philosophy or of philosophers: as, the sect of Epicurus; the sect of the Epicureans.
2. n. A party or body of persons who unite in holding certain special doctrines or opinions concerning religion, which distinguish them from others holding the same general religious belief; a distinct part of the general body of persons claiming the same religious name or origin; especially, such a party of innovators, differing in their beliefs from those who support the older or orthodox views; a party or faction in a religious body; a separate ecclesiastical organization; an ecclesiastical denomination: as, the sects of the Jewish religion (which were not separately organized); the sects of the Christian church (usually separately organized); Mohammedan sects; Buddhist sects. The Latin word secta, from which the English word sect is derived, did not at first become limited in Christian usage to a specific meaning. It was used for ‘way,’ ‘mode of life,’ etc., but also for the Greek αἱρεσις (Latin hæresis, the original of the English word heresy), signifying ‘a school of philosophy, opinion, or doctrine,’ especially peculiar or erroneous doctrine. A familiar application was to the sect of Christians, as distinguished from Jews and pagans. In four of the nine passages in which αἱρεσις is found in the New Testament, the Vulgate has hæresis, in the other five secta. In Acts xxiv. 14 it has “the way (sectam) which they call heresy (hæresim).” The use of secta in these passages led to the meaning of ‘a separate or heretical body,’ which is found in writers of the fourth century, and by desynonymization secta emphasized the organization and hæresis the doctrine. Afterward it came to be supposed that the word secta meant, etymologically, ‘a party cut off’; hence the more or less opprobrious use of sect by many writers. It is often used, however, unopprobriously, in a sense substantially identical with the original sense, to signify ‘a body of persons who agree in a particular set of doctrines.’
3. n. A religion.
4. n. In a general sense, a number of persons holding the same opinions or practising the same customs, or having common associations or interests; a party; following; company; faction.
5. n. Kind; sex: originally merely a particular use of sect in sense 4, but now regarded as a form of sex, and as such avoided as incorrect.
6. n. Apparel; likeness.
7. n. A part cut off; a cutting; scion.
8. n. In geometry: A part cut out on a straight line; a limited straight line or rod; the part or piece of a straight line between two definite points (end-points of the sect); a portion of a given straight line, of definite length.
9. n. A piece of a range bounded by two points.
10. n. Two points, A and B, upon a straight adjective
11. In mathematics, of sects; operating with sects.
12. [lowercase or cap.] An abbreviation of section.

Wiktionary

1. n. A cult or religious movement, a group sharing particular (often unorthodox) political and/or religious beliefs.

GNU Webster's 1913

1. n. A cutting; a scion.
2. n. Those following a particular leader or authority, or attached to a certain opinion; a company or set having a common belief or allegiance distinct from others; in religion, the believers in a particular creed, or upholders of a particular practice; especially, in modern times, a party dissenting from an established church; a denomination; in philosophy, the disciples of a particular master; a school; in society and the state, an order, rank, class, or party.

WordNet 3.0

1. n. a subdivision of a larger religious group
2. n. a dissenting clique