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

Many people may not even be aware that they have the condition until they have experienced a fracture or had a bone density test, typically recommended because of risk factors such as age and menopause.

From Science Daily • Jun. 25, 2026

Czechia put up a strong performance during the first 45 minutes, while Mexico showed little offensive clarity, mainly because of a lack of control in midfield.

From Los Angeles Times • Jun. 25, 2026

"There are people who are very sad, powerless because they couldn't get their pets out," Kolster says.

From BBC • Jun. 25, 2026

“It was hard for him, and hard for us, because I didn’t know how to help—except to be there.”

From The Wall Street Journal • Jun. 25, 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