Noun

(en noun)

the process of being heaved upward, especially the raising of part of the earth's crust

a sudden violent upset, disruption or convulsion

* {{quote-news

, year=2011 , date=September 2 , author= , title=Wales 2-1 Montenegro , work=BBC citation , page= , passage=Since that upheaval Wales have won just once in seven games, beating Northern Ireland in the Nations Cup last May.}}

Noun

(en-noun)

(obsolete) A vast chasm or abyss.

The unordered state of matter in classical accounts of cosmogony

Any state of disorder, any confused or amorphous mixture or conglomeration.

*

(obsolete, rare) A given medium; a space in which something exists or lives; an environment.

*, II.ii.3:

What is the centre of the earth? is it pure element only, as Aristotle decrees, inhabited (as Paracelsus thinks) with creatures whose chaos is the earth: or with fairies, as the woods and waters (according to him) are with nymphs, or as the air with spirits?

(mathematics) 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.