not a fullness as in a liquid absolutely filling a vessel, although this metaphor is quite apt.) See Luke 1:30: "Thou hast found favor with God" (i.e. clearly this is meant in a greater way than others, since Mary was favored enough to bear "God With us"...
GOD'S WORD® TranslationWhen the angel entered her home, he greeted her and said, "You are favored by the Lord! The Lord is with you."Good News TranslationThe angel came to her and said, "Peace be with you! The Lord is with you and has greatly blessed you!" International Standard...