1. The 10th letter of the Roman alphabet
   "His name, John, starts with a J";
   - J

1. The SI unit of energy or work, equal to the work done when a force of one newton moves its point of application one meter
   "The battery's capacity was rated in Js";
   - joule, watt second

Derived forms: Js, js

Type of: alphabetic character, energy unit, heat unit, letter, letter of the alphabet, work unit

Part of: Latin alphabet, Roman alphabet

Encyclopedia: J, Eric