because

By or for the cause that; on this account that; for the reason that.

I hid myself because I was afraid.

I was about to say that I had known the Celebrity from the time he wore kilts. But I see I will have to amend that, because he was not a celebrity then, nor, indeed, did he achieve fame until some time after I left New York for the West.

In plants, the ability to recognize self from nonself plays an important role in fertilization, because self-fertilization will result in less diverse offspring than fertilization with pollen from another individual.

“Perhaps it is because I have been excommunicated. It's absurd, but I feel like the Jackdaw of Rheims.” ¶ She winced and bowed her head. Each time that he spoke flippantly of the Church he caused her pain.

As is known, inferred, or determined from the fact that.

It must be broken, because I pressed the button and nothing happened.

I don't think he is a nice person, because he yells at people for no reason.

obsolèteSo that, in order that.

Simon[…]set the house on fire where he was born, because nobody should point at it.

On account, for sake [with of].

My life is ruined because of you!

obsolèteFor the reason [with that].

And God blessed the seuenth day, and sanctified it: because that in it he had rested from all his worke, which God created and made.

Used alone to refuse to provide a full answer to a question begun with "why", usually taken as an anapodoton of the elided full phrase "Because I said so".

On account of, because of.

He rejected me because revenge, I guess.

It doesn't work because reasons.

You probably know it better, however, as explanation by way of Internet—explanation that maximizes efficiency and irony in equal measure. I'm late because YouTube. You're reading this because procrastination. As the language writer Stan Carey delightfully sums it up: “‘Because’ has become a preposition, because grammar.”