Good definition! To expand on it a little, sin comes from an old archery term that means to miss the point. When we sin, we turn from God and "miss the point" by engaging in things that are bad for us and that will ultimately lead to our death. It is important to note that everyone sins, it's unavoidable. What we do have a choice of is repenting and turning to God, by putting our faith in Christ and truly believing in him and his resurrection, only then can we be saved.