"Word" means "a single distinct meaningful element of speech or writing, used with others (or sometimes alone) to form a sentence and typically shown with a space on either side when written or printed."
But according to https://www.britannica.com/topic/meaning some expressions have meanings but no referents (“the present king of France”) or referents but no meanings (“that”).
I don't understand. By definition, words should have meanings. But Why does it say there are words that have no meanings?