A11ying with Sanna - Web Content Accessibility Guidelines a guide to the accessibility requirements
3 Understandable

3.1.3 Unusual Words

Conformance level: AAA
Criterion released in WCAG version: 2.0

Official description of the success criterion

A mechanism is available for identifying specific definitions of words or phrases used in an unusual or restricted way, including idioms and jargon.

What to do?

Provide definitions for unusual words or jargon.

Why is it important?

Helps users understand the meaning of uncommon terms.

More about this criterion elsewhere