because

Etymology

From Middle English bi cause, from bi (“by”) + cause, modelled on Old French par cause.

adv

1. For the reason (that).
2. On account (of), for sake (of).
   My life is ruined because of you!
3. (by ellipsis) Used alone to refuse to provide a full answer a question begun with "why", usually taken as an anapodoton of the elided full phrase "Because I said so".

conj

1. By or for the cause that; on this account that; for the reason that.
   I hid myself because I was afraid.
   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. 2013 May-June, Katrina G. Claw, “Rapid Evolution in Eggs and Sperm”, in American Scientist, volume 101, number 3
2. 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.
3. (obsolete) So that, in order that.

prep

1. (colloquial, Internet slang) On account of, because of.
   He rejected me because revenge, I guess.
   It doesn't work because reasons.