used in an unusual or restricted way

words used in such a way that requires users to know exactly which definition to apply in order to understand the content correctly

Example: The term "gig" means something different if it occurs in a discussion of music concerts than it does in article about computer hard drive space, but the appropriate definition can be determined from context. By contrast, the word "text" is used in a very specific way in WCAG 2, so a definition is supplied in the glossary.

Source: WCAG 2.2 definition of “used in an unusual or restricted way” (opens in a new tab) (W3C)