Exactness — the same right answer, every single time, down to the tiniest detail.
📰 Seen in the news
Scientists in Singapore built the world's most accurate clock — measured to 19 decimal places — using the element lutetium at the National University of Singapore. Two of them ticked in agreement so precisely the experiment could sense gravity's effect over a 5-millimetre height difference. Published in Nature, 23 Sep 2026.
Precision is how exactly you can repeat a result. The NUS lutetium clock is the new champion: its uncertainty is 0.0000000000000000001 — nineteen zeros. So precise it can feel time slow down between two spots on the same table just 5mm apart (gravity really does bend time — Einstein again). From Latin praecisio: a cutting-short of all error.
Keep it: A dart in the bullseye = accurate. Five darts in the same tight spot = precise. Champion clocks do both.
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