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WCAG 3.1.4: Abbreviations (Level AAA)

Think of abbreviations as a quick introduction—“NASA (National Aeronautics and Space Administration),” “PIN (Personal Identification Number),” or “MI5 (Britain’s Security Service).”

When you expand abbreviations the first time they appear, everyone’s on the same page, and you’re not leaving anyone behind in a haze of alphabet soup.

Abbreviations make sure that these uncommon terms are clarified, making content easier to understand for everyone.

Who this impacts

  • People using screen readers: Screen readers may mispronounce abbreviations, so expanding them improves understanding.
  • Language learners: Users who are new to the language benefit from seeing the full form, preventing confusion.
  • Everyone: Providing the meaning for abbreviations helps everyone follow content smoothly, especially on technical or specialized topics.

How to meet Abbreviations

  • Expand abbreviations on first use: Add the full phrase in parentheses after the abbreviation like FAQ (Frequently Asked Questions).
  • Provide explanations for uncommon abbreviations: If an abbreviation is technical or specific to your field, give context or explanations where possible.
  • Use a glossary for frequent abbreviations: Include a glossary on technical pages to clarify terms and abbreviations for quick reference.

Practical example

An academic site explains, “QED (Latin: quod erat demonstrandum; that which was to be demonstrated)” the first time it’s used in an article, helping readers understand the meaning and purpose of the phrase.

Top tips

  • Clarify less-known terms: Add full forms for abbreviations that might be unfamiliar to some readers the first time they appear in the text.  If you use the term again after a long break in the text, consider adding the explanation at this point, too.
  • Keep explanations concise: Write out abbreviations without overloading the text, so readers stay engaged.
  • Test readability: Confirm with screen readers that abbreviations are clear and easy to follow.

Further reading

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