A person who approves something jointly with another person or gives shared approval.
From co- (together) + approver (one who approves), from Old French aprover. The term emerged in legal contexts where multiple signatures or confirmations were required.
Banks and governments still use approval chains where multiple people must sign off—this word captures that ancient legal need for distributed trust before we even had bureaucracies.
Complete word intelligence in one call. Free tier — 50 lookups/day.