Plural of 'bene' or a standalone noun; possibly a variant spelling or abbreviation, or the plural of a name.
Uncertain origin; could be a plural form from Latin 'bene' (well) or a surname plural. Limited documentation makes full etymology difficult to establish.
This is a word that exists in some dictionaries but has almost no modern usage—it's like finding a word in a crossword that you can't figure out because it's too archaic!
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