because

[bih-kawz, -koz, -kuhz]
See more synonyms for because on Thesaurus.com
preposition
  1. 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!
Idioms
  1. because of, by reason of; due to: Schools were closed because of heavy snowfall.

Origin of because

1275–1325; Middle English bi cause. See by1, cause

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. 2018

Related Words for because

as, being, considering, for, over, seeing, since, through, whereas

British Dictionary definitions for because

because

conjunction
  1. (subordinating) on account of the fact that; on account of being; sincebecause it's so cold we'll go home
  2. because of (preposition) on account ofI lost my job because of her

Word Origin for because

C14 bi cause, from bi by + cause

xref

See reason
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for because
conj.

c.1300, bi cause "by cause," modeled on French par cause. Originally a phrase, often followed by a subordinate clause introduced by that or why. One word from c.1400. As an adverb from late 14c. Clipped form cause attested in writing by mid-15c.

Online Etymology Dictionary, © 2010 Douglas Harper