Unities

noun

1. Oneness; the state or fact of being one undivided entity.
2. Agreement; harmony.
3. A single undivided thing, seen as complete in itself.
4. Any of the three classical rules of drama: unity of action (nothing should be admitted not directly relevant to the development of the plot), unity of place (the scenes should be set in the same place), and unity of time (all the events should be such as might happen within a single day).
5. The number 1 or any element of a set or field that behaves under a given operation as the number 1 behaves under multiplication.