Why is an inch an inch?

Related questions

1. How do you count inches with your fingers?
2. How can I measure 12 inches without a ruler?
3. How do you write 4 feet 9 inches?
4. Does mean inch?
5. What is the difference between metric and standard bolts?
6. What is smaller than an inch?
7. How do you calculate decimal feet?
8. What is a inch long?
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10. How do you convert inches to kilograms?

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1. #equal
2. #british
3. #officially
4. #imperial
5. #since
6. #derives
7. #latin
8. #uncia
9. #measure
10. #united
11. #states
12. #english
13. #defined
14. #customary
15. #roman
16. #which
17. #twelfth