What is the meaning of κύριος?

ruling, governing, having power

decisive, critical, authorized, valid, legal, entitled

fixed, set, appointed

literal

main, major, primary, principal

lord, master, guardian, ruler, owner, teacher

"Sir"

God (i.e., the God of Israel)

mister (title conferred on an adult male)

master (someone who has control over something or someone)

sir (an address to any male)

main, principal, most important

Source: wiktionary.org