because

American  

[bih-kawz, -koz, -kuhz] / bɪˈkɔz, -ˈkɒz, -ˈkʌz /

conjunction

1. for the reason that; due to the fact that.

   The boy was absent because he was ill.

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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.

because British  

/ -ˈkəz, bɪˈkɒz /

conjunction

1. (subordinating) on account of the fact that; on account of being; since

   because it's so cold we'll go home

2. (preposition) on account of

   I lost my job because of her

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Usage

See reason.

Etymology

Origin of because

First recorded in 1275–1325; Middle English bi cause; see by ( def. ), cause ( def. )

Example Sentences

The couple is seeking $25 million in damages, claiming that because their team didn’t have the documents suppressed, they were convicted on every count.

From Los Angeles Times • Jun. 12, 2026

When Facebook went public, some investors who tried to change or cancel orders ahead of trading didn’t get confirmations because of a technology malfunction.

From The Wall Street Journal • Jun. 12, 2026

"Iran will be constrained by the amount of resources that they can deploy to rebuilding, because they will also have to address basic economic conditions."

From BBC • Jun. 11, 2026

Sellers have reduced their risk because they don’t know when the chip and manufacturing customers will slow down the growth of their data center investments.

From Barron's • Jun. 11, 2026

I step forward to follow, because I don’t want to lose the warmth and hopefulness they bring to me.

From "Split the Sky" by Marie Arnold