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.
(Video). Stamina is an energy in the body that helps you complete any type of task over a long period of time. Find out about what losing stamina means with help from a personal trainer with 20 years of experience in this free video clip. advertisement.