Capt/ˈkæptɪn/ Definition 1 of 1Pro Tip 1/3Abbreviation Usage Use 'capt' before a name to address or refer to someone in charge, like a ship’s captain. Capt. Stevens will brief the crew. Pro Tip 2/3Cultural Reference 'Capt.' also appears in fictional titles and names, such as superheroes like Captain America. I dressed as Capt. America for Halloween. Pro Tip 3/3Respect and Authority Using 'capt' implies respect for someone’s authority or recognition of their higher rank. The crew saluted as Capt. Martinez walked by.