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.
Definition of capricious for English Language Learners. : 1  changing often and quickly; especially : often changing suddenly in mood or behavior. : 2  not logical or reasonable : based on an idea, desire, etc., that is not possible to predict.