second lieutenant second law of thermodynamics • secondly · · · Info · Definitions · Synonyms · Characters · · second lieutenant · · Text Common · · Latin · · Scripts 17 · · Length 6 · · Syllables Definitions · · · (noun) a commissioned officer in the Army or Air Force or Marine Corps holding the lowest rank. Synonyms: second lieutenant, 2nd lieutenant. · · Noun Definition 1 Synonyms · · · 2nd lieutenant · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075