Kurios means lord, master, or owner, and in the New Testament it becomes the great confession of the church. The Greek Old Testament used kurios to translate the divine name of God — so when the first Christians called Jesus kurios, they were making an astonishing claim: that Jesus is Lord in the fullest, divine sense.
The earliest Christian creed was three words: Jesus is Lord. To confess him as kurios is not only to admire him but to submit to him — to acknowledge his rightful ownership and rule over one's life. Scripture promises that one day every knee will bow and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.
Kurios in Scripture
And that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.