In the context of Christian salvation, the word, “propitiation” means the turning away of wrath or anger usually by an offering. Propitiation appeases the wrath of God rightly brought about by our sin. First John 4:10 summarizes, “In this is love, not that we have loved God but that he loved us and sent his Son to be the propitiation for our sins (1 John 4:10 ESV).”
On the Cross, Jesus satisfied the wrath of God by dying in the place of Christians.
If you find yourself uncomfortable with the idea of the wrath of God, see Sam Storms’ Can a God Without Wrath Be Good?
 Leon Morris, The Cross of Jesus (Grand Rapids: Eerdmans, 1988), 6.
 Millard Erickson, Christian Theology (Grand Rapids: Baker, 1990), 809.
 Chris Brauns, “The Most Important Paragraph Ever Written!,” A Brick in the Valley: The Web Site of Pastor and Author Chris Brauns, March 19, 2010, http://chrisbrauns.com/2010/03/the-most-important-paragraph-ever-written/.
 Collin Hansen, “Keith Getty on What Makes ‘In Christ Alone’ Accepted and Contested,” TGC – The Gospel Coalition, December 9, 2013, https://www.thegospelcoalition.org/article/keith-getty-on-what-makes-in-christ-alone-beloved-and-contested.