The common rootword for English church and Scottish kirk is Greek kyriakon. What does kyriakon literally mean?

There is some uncertainty on the exact development of the word "church." The Compact Oxford English Dictionary says its origin is "from Greek kuriakon doma ‘Lord’s house’." Kuriakon is from kurios ‘master or lord’. According to The Online Etymology Dictionary, it is from the Old English cirice, from West Germanic kirika, and from Greek kyriake, meaning Lord’s, and the Greek adjective kyriakon, of the Lord.