God's acceptance of an offering or person — the ultimate positive verdict. When God ratsah a sacrifice, it is accepted; when a person, they are favored. Connects to grace and election.
The question 'Will God accept/favor me?' is central to OT worship. The Day of Atonement and the entire sacrificial system worked toward ratsah — God's pleasure in his people.
Jesus opens his ministry by citing Isaiah 61:2 — 'the year of the LORD's favor (ratsah)' — and declaring it fulfilled (Luke 4:21). He is the one in whom God is fully pleased (Matt 3:17).