Lt en · NOUN Meanings (abbreviation, alt-of) Abbreviation of lieutenant, particularly as used in a title. alt of lieutenantalt of particularly as used in a title (Australia, abbreviation, alt-of) Abbreviation of Little in street names. alt of Little in street names Walk to the Lt Lonsdale St end of Drewery Lane and turn left, continue under the Melbourne Central walkway to the corner of Elizabeth St. 2025 January 27 (last accessed), Dottie, Walking Maps: Deriveds Lt. Col.