An archaic or rare term for an advisor; a person who gives advice or counsel.
From Spanish or Italian 'avviso' (meaning 'notice' or 'advice'), or a variant of the English 'advisor.' This appears to be a historical or obsolete form.
This word is practically extinct in English—it's the kind of word you find in 16th-century documents but nobody has used seriously for centuries, showing how vocabulary naturally ages out when simpler alternatives (like 'advisor') do the job better.
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