In #2483, we identified some terms that could use a `<dfn>`. * ["property key"](https://github.com/tc39/ecma262/pull/2483#discussion_r683111221) * ["Iterator Record"](https://github.com/tc39/ecma262/pull/2483#discussion_r683112158) * ["IteratorResult"](https://github.com/tc39/ecma262/pull/2483#discussion_r683112677) and [other interface names](https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-common-iteration-interfaces) We should remove italics from existing usages and use these terms wherever applicable. Also, [in RegExp](https://tc39.es/ecma262/multipage/text-processing.html#sec-notation): - CharSet - State - MatchResult - Continuation - Matcher