The Catechism in Questions & Answers

111. What is meant by the majestic title of “Christ”?

“Christ” originally comes from the Greek language (Christos) and means “Anointed One” in translation.
In Old Testament times, kings were anointed with oil (cf. Psalm 20: 6). This act signified consecration to a holy service. Jesus is described as the “Anointed One” because He is Lord over all, because He reconciles mankind with God, and because He proclaims the will of God.
The majestic title “Christ” is so closely associated with Jesus that it has become a proper name: Jesus Christ.