"Retroactive continuity". the deliberate changing of previously established facts in a work of serial fiction. The change is informally referred to as a "retcon", and producing a retcon is called "retconning".
Definitions include: LT, L-T, L.T., eltee, El-Tee noun a lieutenant, US From the common abbreviation "Lt." - "Could you tell me where I can find the platoon leader?" "Say? The El-Tee?" - "The L.T. was kind enough to let us use his office."