The Greek word mesos (μέσος) means middle, midst, center, or among. As an adjective it describes something in the center; as a prepositional phrase (en mesō — 'in the midst') it indicates location among a group. It appears about 56 times in the New Testament and is used of physical location, group membership, and divine presence within a community.
The phrase en mesō ('in the midst') carries profound theological weight in both Testaments. In Revelation 5:6, the Lamb appears 'in the midst' of the throne — the glorified Christ occupies the center of heaven's worship. In Matthew 18:20, Jesus promises: 'Where two or three gather in my name, there am I with them' — He is en mesō, in the midst of gathered believers. This echoes the Old Testament Shekinah presence dwelling in the midst of Israel (Exodus 25:8; Ezekiel 43:7). The spatial language of divine immanence reaches its climax in Revelation 21:3: 'God himself will be with them and be their God' — the ultimate en mesō, God dwelling in the midst of His redeemed creation.