heat energy heated up • heat engine · · · Info · Definitions · Synonyms · Characters · · heat energy · · Text Common · · Latin · · Scripts 11 · · Length 4 · · Syllables Definitions · · · (noun) a form of energy that is transferred by a difference in temperature. Synonyms: heat, heat energy. · · Noun Definition 1 Synonyms · · · heat · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 h latin small letter h U+0068 n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079