noun Download 🔗Share In the International System of Units, the derived unit of energy, work and heat; the work required to exert a force of one newton for a distance of one metre. Also equal to the energy of one watt of power for a duration of one second. Symbol: J Examples : "Example Sentence: "It takes about one joule of energy to lift a small apple one meter." " energy physics science unit technical work Chat with AIVocabulary GamePractice Reading