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WCAG 3.1.3: Unusual Words (Level AAA)

Words like “quixotic” (foolishly impractical, especially in the pursuit of ideals) or “mercurial” (subject to sudden or unpredictable changes of mood or mind) might be interesting to some, but they can trip up others—especially language learners, people with cognitive disabilities, or anyone unfamiliar with them.

Unusual Words ensures that complex or rare terms are clarified, helping users navigate content without getting lost in vocabulary.  (See what we did there?)

Who this impacts

  • People with cognitive impairments: Clear explanations of complex or unfamiliar terms help these users understand content and avoid confusion.
  • Language learners: People learning the language benefit from clear explanations of unfamiliar terms.
  • Everyone: Providing context for unusual words makes content clearer, especially on technical or educational sites.

How to meet Unusual Words

  1. Define or link unusual terms: Use definitions or links to help users understand uncommon or specialized vocabulary without needing outside resources.
  2. Use plain language where possible: Aim for simplicity in word choice unless the term is crucial to meaning.
  3. Include glossaries: For pages with specialized or technical terms, offer a glossary to explain meanings without overloading the text.

Practical example

A medical website includes definitions for technical terms like “angioplasty” and “thrombosis,” using tooltips or linked glossaries to support users unfamiliar with medical jargon.

Top tips

  • Provide quick definitions: Include explanations in tooltips or parentheses to avoid disrupting the reading flow.
  • Use a glossary for specialized fields: A glossary keeps explanations available without cluttering content.
  • Aim for clarity and context: Make sure definitions are easy to access and integrated smoothly into the reading experience.

Further reading

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