unity

unity /ˈjunɪti/

Noun: unity (countable and uncountable; plural unities)

1. (uncountable) oneness; state of being one or undivided; united in mind or purpose

2. (drama) (countable) any of the three classical rules of drama (unity of action, unity of place, and unity of time)

3. (mathematics) (countable) any element of a set or field that behaves under a given operation as the number 1 behaves under multiplication