The term faction comes from Latin roots, specifically from the voice “factĭo” or “factiōnis” and it derives from “factum” from the non-personal form of the Latin verb “facere” which means “to do”. Faction is a word that according to the dictionary of the Royal Spanish Academy has multiple meanings that may or may not be related to each other; one of these possible concepts refers to "the partiality of mutinous or rebellious people"; Another of them describes that it is a violent sector, gang, side or group in terms of its designs, conduct or work.
In other words, this word generally refers to a party or clan made up of a certain group of people, almost always with the same belief or ideology, who are looking for something in particular, opposing certain circumstances compared to the majority and who can reach take a more radical behavior or stance.
It can be a fragmentation within a political group or when it is used in contexts related to rebellions, civil war or insurgency, it generally describes a movement of a broader social nature. People who follow these factions and who agree in their opinions are called "factional", especially those armed rebels. On certain occasions it is often confused with fascist factious, also this first with fascio, although more than anything it is a paronymic confusion or semantic relationship.
On the other hand, the word faction, mostly used in the plural, that is, factions, is applied to the structures or parts that make up the face of a human being.