It means lord, master, owner.
The word emphasizes authority and supremacy.
John 4:11 Luke 19:33 Colossians 3:22 1 Corinthians 8:5 1 Peter 3:6.
Most of the 717 times that Kyrios is used in the New Testament are by Luke (210 times) and Paul (275 times), for they wrote to the people of Greek culture and language. When we talk about God as Kyrios, it expresses particularly His position as Creator, His power revealed in the history, and His rightful domain over the universe. The use of Kyrios in the New Testament has been subject of discussion among the modern scholars. There are three schools of thought about this subject. The first, based in the use of the Septuagint, affirms that the title LORD is pretended to assign Jesus the attributes of the Old Testament's God. The reasoning here is that at some point, after the Septuagint was written, when Jews read it out loud, they pronounced Adonai (Hebrew word for Lord) every time they found the name of God "YHWH". Later, the name of God was eliminated and replaced with Kyrios.