Greek: λυτρωσις [lutrôsis] (Noun feminine). From: λυτροω [lutroô]. A ransoming, redeemed, redemption.

λυτρωσις [lutrôsis] appears 3 times in the NT:

(1) Luke 1: 68
Blessed [be] the Lord God of Israel; for he hath visited and redeemed* his people, - λυτρωσιν [lutrôsin] Accus. sing. (*"redeemed" - εποιησεν λυτρωσιν [epoiêsen lutrôsin] Lit: "makes redemption").

(2) Luke 2: 38
And she coming in that instant gave thanks likewise unto the Lord, and spake of him to all them that looked for redemption in Jerusalem. - λυτρωσιν [lutrôsin] Accus. sing.

(3) Hebrews 9: 12
Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption [for us]. - λυτρωσιν [lutrôsin] Accus. sing.