What is Additional Legacy?

Legal Definition
An additional legacy is one which is given by a codicil, besides one before given by the will; or it is an increase by a codicil of a legacy before given by the will. An additional legacy is generally subject to the same qualities and conditions as the original legacy. 6. Mod. 31; 2 Ves. jr. 449; 3 Mer. 154; Ward on Leg. 142.
-- Bouviers Law Dictionary
Legal Definition
One given to the same legatee in addition-" to (and not in lieu of) another legacy given before by the same will or in a codicil thereto
-- Black's Law Dictionary