From Latin 'deliberare' (to weigh on scales), from 'libra' (balance) — the same root as the zodiac sign Libra and the British pound (£).
Done consciously and intentionally; fully considered.
From Latin 'deliberatus,' past participle of 'deliberare' (to consider carefully), from 'de-' (entirely) + 'librare' (to weigh), from 'libra' (a balance, scales). To deliberate is literally to 'weigh up' options on a mental scale. Key roots: de- (Latin: "entirely, thoroughly"), libra (Latin: "balance, scales").
When you 'deliberate,' you're using mental scales. Latin 'libra' (balance) is the root — the same Libra that's a zodiac sign (the scales of justice). The British pound symbol £ stands for 'libra' too — a pound was originally a pound-weight of silver, measured on a balance. So deliberation, the zodiac, and British currency all come from the same Roman weighing device.