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[bitsauce]

Example: https://en.wiktionary.org/wiki/number, first definition says:

(countable) An abstract entity used to describe quantity.

where the countable, redirects to https://en.wiktionary.org/wiki/Appendix:Glossary#countable

which in return, says

countable, countable noun, count noun
Describes a noun which can be freely used with the indefinite article (a or an in English) and with numbers, and which therefore has a plural form. Antonym: uncountable, or mass noun.

In the tooltip, this description would show while hovering over countable