noun

• (mathematics) A behaviour of iterative non-linear systems in which arbitrarily small variations in initial conditions become magnified over time.
• (fantasy) One of the two metaphysical forces of the world in some fantasy settings, as opposed to law.
• (obsolete) A vast chasm or abyss.
• (obsolete, rare) A given medium; a space in which something exists or lives; an environment.
  "What is in the centre of the earth, or is it pure element only, as Ariſtotle decrees inhabited as Paracelſus thinks with creatures, whoſe Chaos is the earth with Fairies, as the woods and waters according to him, are with Nymphes or as the ayre with ſpirits."

name

• (Greek mythology) In Greek mythology, the primordial state of disorder that exists before the creation of the world, or the first being or deity to exist.
• (astronomy) A planetoid and cubewano orbiting in the Kuiper belt.
• (fantasy, science fiction) In the Warhammer franchise, a demonic antagonist that sends demons, monsters, warriors, and beasts to wage war on the games' setting.
  "Chaos warrior, Chaos daemon"

noun

• (slang) Initialism of can't have anyone over syndrome.