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.
stamÂ·iÂ·na 1. (stÄmâ²É-nÉ) n. Physical or moral strength to resist or withstand illness, fatigue, or hardship; endurance. [Latin stÄmina, pl. of stÄmen, thread, thread of life spun by the Fates; see stamen.] stamâ²iÂ·nal (stÄmâ²É-nÉl) adj.