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capital letters.
(in prescriptions) a capsule.
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Origin of caps.

(def. 2) <Latin capsula
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022


What does caps mean?

Caps is an informal, short way of saying capital letters—the bigger, taller versions of letters (like W), as opposed to the smaller versions, which are called lowercase letters (like w).

Capital letters are also called uppercase letters or simply capitals.

A word written entirely in capital letters (like WHAT) is said to be written in caps or all caps. The adjective uppercase can be used to mean the same thing.

To capitalize a word is to put its first letter in caps—to make it a capital letter.

Some acronyms and abbreviations are written using all caps, such as NASA and U.S.

The key on a keyboard that results in all letters being in caps is called caps lock (or sometimes caps for short).

In informal communications like text messages and online posts, caps is often used for emphasis or to convey excitement or to mimic yelling.

Example: My mom keeps sending my texts in ALL CAPS and I can’t tell if she’s mad at me.

Where does caps come from?

The term caps has been used as a shortened form of capital letters since at least the 1800s. The word capital comes from the Latin capitālis, meaning “concerning the head,” or “chief,” from caput, “head.”

It can be confusing to know whether or not to use a capital letter in certain situations, but a capitalization guide can help.

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What are some synonyms for caps?

What are some words that share a root or word element with caps

What are some words that often get used in discussing caps?

How is caps used in real life?

Caps is informal. It’s especially used in the phrase all caps. In casual communications, words are sometimes written in caps for emphasis.

Try using caps!

Which of the following words is spelled in all caps?

A. yelling
B. Yelling
D. yELliNg

How to use caps. in a sentence

British Dictionary definitions for caps.


abbreviation for
capital letters
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