One who exercises; a practitioner or trainer; in legal contexts, the employer of a ship or its captain.
From Latin exercitor, agent noun from exercere (to exercise, manage, drive). The maritime sense evolved in Roman law and persisted in legal terminology.
In maritime law, an 'exercitor' had specific legal responsibilities for ships—this specialized meaning shows how Latin legal terms preserved meanings that the common exercise/exerciser pair never developed.
Complete word intelligence in one call. Free tier — 50 lookups/day.