> The kind of [[Definition|definition]] that pins a term down by *listing the actual things it picks out*. ^definition Rather than by stating its meaning or pointing at a single example. > Every real dog there is. ^example The actual things a word refers to. An extension is only as portable as the list itself - useful for settling *which cases count*, not for handing someone the rule.[^1][^2] [^1]: https://en.wikipedia.org/wiki/Extension_(semantics) [^2]: https://donaldrobertson.name/2026/03/17/how-to-use-semantics-to-manage-emotions/