- For other uses of the word, see cosmos (disambiguation)
The cosmos is the universe, especially when thought of as an orderly or harmonious system.
Sometimes the term 'cosmos' is considered to be only the observed universe, while the term "universe" refers to all that exists whether it has been discovered or not. 'Cosmos' is the "known universe."
In English, it may also be spelled "kosmos". The word is derived from Greek.