He laid his right hand on me, saying, “Don’t be afraid. I am the first and the last,
18and the Living one. I was dead, and behold, I am alive forever and ever. Amen. I have the keys of Death and of Hades.
20The mystery of the seven stars which you saw in my right hand, and the seven golden lamp stands is this: The seven stars are the angels of the seven assemblies. The seven lamp stands are seven assemblies.
"Lord's" (Gk. κυριακῇ ἡμέρᾳ, kuriake hemera). (1:10; 1 Cor 11:20) Strong’s 2960
The word “Lord’s” occurs only twice in the NT, “day” is very common. The word “Lord’s” is used here for the “Lord’s day,” and in 1 Corinthians 11:20 it is used for the “Lord’s Supper.” It simply refers to that which belongs to and is associated with the Lord, Jesus Christ. The Lord’s Supper belongs to Him, is about Him and associates its participants with Him.
What of the Lord’s “Day?” First, it was a Sunday, associated with Jesus since it was the day of His resurrection, important in the life of the church from the beginning. Further, the day belongs to Jesus Christ and is about Him. John’s use of this term seems to identify Sunday as a day that is sacred and set aside for Jesus. This is not the Jewish Sabbath, but a celebration of the Lord’s resurrection and a dedication of the day to Him and His service. It is incumbent upon Christians to set aside Sundays for the Lord. Interestingly, some argue that the English word “church” comes from this Greek word for “Lord’s” through the Teutonic “kirk.”