What is the meaning of Kilojoule?

An SI unit of energy equal to 10 joules. Symbol: kJ

kilojoule (an SI unit of energy equal to 10 joules)

kilojoule (1000 joules)

Pre-reform spelling (used until 1943 in Brazil and 1911 in Portugal) of quilojoule; now a common misspelling.

kilojoule

Source: wiktionary.org