Plural of kilo; units of weight or mass equal to 1,000 grams, commonly used to measure heavy items like flour, drugs, or produce.
From French 'kilo,' short for 'kilogramme,' which combines the Greek prefix 'kilo-' meaning 'thousand' with the French 'gramme' (from Latin 'gramma'). The term emerged in the late 18th century as part of the metric system developed in France.
The metric system was designed during the French Revolution as a way to standardize measurements and break from the old aristocratic system—so 'kilo' is literally a word born from political revolution! Today it's used worldwide except in the US, making it one of humanity's most successful international standards.
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