Victory is winning a battle or a war-overcoming an enemy. Jesus fought a battle for us against sin and death, and gained the victory:

"Where, O Death, is your victory? Where, O Death, is your sting? The sting of death is sin, and the power of sin is the Law. But thanks be to God! He gives us the victory through our Lord Jesus Christ." (1 Corinthians 15:55-56).