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.
Patience is a person's ability to wait something out or endure something tedious, without getting riled up. It takes a lot of patience to wait for your braces to come off, to deal with a toddler's temper tantrum, or to build a house out of toothpicks.