AM and PM are associated with 12-hour timekeeping, as opposed to the international 24-hour clock. The 12-hour system grew up mainly in Northern Europe, and spread globally from there via the British Empire.
The adjective STRENUOUS has 2 senses: 1. characterized by or performed with much energy or force. 2. taxing to the utmost; testing powers of endurance. Familiarity information: STRENUOUS used as an adjective is rare.
or strived, striving. 1. to exert oneself vigorously; try hard: He strove to make himself understood. 2. to make strenuous efforts toward any goal: to strive for success. 3. to contend in opposition, battle, or any conflict; compete.