How is the word 'universe' defined?

'Universe' is defined by the following senses:

NOUN

1) everything that physically exists; all matter, energy, and forces that are governed by the laws of physics contained within a three-dimensional volume of space; creation; the cosmos

2) a separate and different reality from our own with its own space-time dimensions, its own matter, and governed by its own laws of physics

3) all humans living on Earth; humanity; society; the world

4) planet Earth together with all its living organisms; the biOSphere

5) the huge nebula of stars and interstellar material containing Earth seen as a bright band of light stretching across the night sky; the Milky Way; the Galaxy

6) in logic, all topics relevant for discourse; a universe of discourse

7) in statistics, all elements of a set from which samples are taken; a population

8) a sphere of activity or interest concerning a person or a group of people