It is Latin for Note Well. It literally means pay attention to what I am writing.
The adjectives "posh" and "upper class," the adverb "well," the interjection "Fine, O.K." or the nouns "(the) good" and "(the) right" may be English equivalents of "bene."Specifically, the word...
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it means good
NB.... Note well, to take notice of. It's from Latin.
good or well