1(a). Six terms, and two of them govern later requirements

Warning. TWO OF THESE SIX TERMS ARE INSTRUCTIONS RATHER THAN VOCABULARY. Invisible disability is the entire subject of requirement 4 Option B, and is named again in 3(e). Person-first language is not merely defined here: requirement 5(a) says to explain AND USE it during your presentation. The other four, disability, accessibility, adaptation and accommodation, are the language the rest of the badge is written in, and the distinction between adaptation and accommodation is the one most often blurred. ON PERSON-FIRST LANGUAGE, KNOW THAT IT IS NOT UNIVERSAL. Parts of the autistic and Deaf communities prefer identity-first language and say so clearly. The requirement asks you to explain and use person-first language, and understanding why some people choose otherwise is what turns a rule you have memorised into something you understand.