One who assents or agrees; a person expressing approval or consent to something.
From Latin 'assentitor' (one who agrees), formed from 'assentire' plus the agent suffix '-tor'. This was the classical Latin term before English adopted the '-er' suffix variant.
Latin had both '-tor' and '-er' agent suffixes, and English inherited the '-er' version, yet legal and ecclesiastical documents kept using '-tor' forms like 'assentor' to sound more authoritative and formal—suffix choice was a way of dressing language up.
Complete word intelligence in one call. Free tier — 50 lookups/day.