1. Everything we know about anything and everything that we have been exposed to that is in existence. Anything that we don't know or have not been exposed to is not part of our universe, and could be considered 'nonexistence' or 'nothing'.

Stating that there are multiple universes that exist, or a 'multiverse' violates the actual definition of a universe.

If we know about other universes, they automatically become a part of our commutative universe, or a part of the overall knowledge we have of everything and anything in existence.

2. The universe is everything that is currently present in the reality or realm of existence. It is everything that has existed in the past, and everything that will exist in the future.

3. It is an accumulation of our observable space-time and can only be defined based upon our reality and the three dimensional* space-time structure that we observe and experience.

*Even if other dimensions were present in space, we cannot define them as part of the universe because we do not directly interact with them, and cannot be affected by their presence. Some suggest that it may be impossible for our reality (our observable area of space-time) to interact with the most distant regions of space (the place where these additional dimensions may occur). This is caused by light's theorized inability to travel faster than the expansion of the universe. Because we cannot interact with other dimensions, we cannot consider them part of our universe.
Note: All of these definitions of 'universe' are intended to go hand-in-hand with one another. They all are suggested to be simultaneously true.

1. Spacetime, we know that spacetime exists. It is part of our universe. It is expanding. We do not know what it is expanding into. It is expanding into 'nonexistence'.

2. Benjamin Franklin existed, and there is then light that contains his image somewhere in the universe. He is a part of the universe. The sun will rise tomorrow morning, and that moment in spacetime is part of our universe as well, even though the light has not reached us or been created yet.

3. I can move my hand through 3 evident dimensions of space without being effected by any additional dimensions in my reality, therefore these three dimensions are part of the universe, and any additional undetectable, theorized dimensions are considered 'nonexistent' because I do not observe them nor do I know about them.
by Sellious November 5, 2011
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A thing infinitely more mysterious than anything our tiny little fucking ignorant brains could ever begin to grasp a true understanding of.
“It’s stands to reason that the Universe was created by some guy a few thousands year ago. Yeah, definitely.”
by áutechre August 7, 2018
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A collection of everything in existence subjectively considered as a whole.
The universe is a collection of everything in space subjectively considered as a whole, so if you consider an extremely hypermassive globular cluster of galaxies floating in an infinite empty dark void (aka. Chaos) to be everything in space as a whole, then that would be the universe, in your opinion.

(Note: The universe isn't to be confused with the omniverse, which is literally everything inside & outside existence. Please read the definition of omniverse for more information).
by DianaLuciusDeCollis July 5, 2022
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possibly the BIGGEST mistake ever made period!
Hitchhiker's Guide: In the beginning, the universe was created. This made a lot of people very angry and has been widely regarded as a bad move.
by Panthean April 23, 2008
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Once a mechanism whereby smart people could raise themselves above humble beginnings and obtain a worthwhile qualification indicating a high probability of being employable. Now a complete con to get kids with high hopes into insurmountable amounts of debt before they even think about buying a house.. then they discover that the job they trained for was entirely fictitious, and they'll have to take any job they can get. At this point, they realise they should have gone into benefit fraud and drug dealing like all their "stupid" friends, who now have houses, cars and big screen TVs.
John always did well in his school classes, and did three A-Levels and got good grades. He went to uni for three years which put him about £30,000 in debt. When he finished his course he found that his degree counted for very little, since he had no experience and the other 400 job applicants also had degrees. He took a job as a sales rep with Coca-Cola, but got fired when he went to an interview for a better job. Meanwhile the cost of living rose exponentially, and by the age of 24, John's debts stood at around £45,000. This was before he even got a mortgage. A couple of years afterwards he divorced his wife on the grounds of infidelity, but she got custody of the kids, and now he doesn't even get to see them despite paying atrocious amounts of child support. Welcome to Blair's Britain.
by believe me it happens February 28, 2004
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A big booze off which leaves you in debt and almost jobless.
Hey mom I'm going to university
mom: Don't get too drunk sweetheart
by Rapidshark112 May 5, 2023
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