Ever since upgrading to Mac OS Sequoia, I have noticed that the "define" command in the Alfred App's dictionary returns the exemplar sentence rather than the definition on occasion. This makes the "define" feature decidedly less helpful. This happens with ~40% of the words for which I search. I can't pinpoint a commonality for certain, but I think the common thing between the words is that they have entries in the Mac OS Thesaurus.
If there is a thesaurus entry, the exemplar sentence appears
If there is no thesaurus entry, the definition appears
Example 1: define effrontery (screenshot 1) -- contains thesaurus entry = shows exemplar sentence
Example 2: define bagel (screenshot 2) -- contains no thesaurus entry = shows definition
Hope this is helpful,
~ Tim