because
[bih-kawz, -koz, -kuhz]
conjunction
for the reason that; due to the fact that: The boy was absent because he was ill.
preposition
Informal. (used directly before a noun, adjective, verb, interjection, etc., to convey a very concise rationale, excuse, or explanation): We’re a little like monkeys because evolution. He doesn’t practice enough: because lazy. I love doughnuts because yum!
Origin of because
Synonym study
1. Because, as, since, for, inasmuch as agree in implying a reason for an occurrence or action. Because introduces a direct reason: I was sleeping because I was tired. As and since are so casual as to imply merely circumstances attendant on the main statement: As (or since ) I was tired, I was sleeping. The reason, proof, or justification introduced by for is like an afterthought or a parenthetical statement: I was sleeping, for I was tired. The more formal inasmuch as implies concession; the main statement is true in view of the circumstances introduced by this conjunction: Inasmuch as I was tired, it seemed best to sleep.
Usage note
1. See reason.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
because
conjunction
Word Origin for because
C14 bi cause, from bi by + cause
xref
See reason
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Online Etymology Dictionary, © 2010 Douglas Harper