A dwelling place or habitation — used for the tombs where Legion dwelt and for the dwelling of God's Spirit in believers.
The Greek katoikēsis (from katoikeō, to dwell) means a place of permanent dwelling or habitation. It appears once in the NT in its noun form: Mark 5:3, where the demoniac Legion 'lived (katoikēsin) in the tombs' — his dwelling was among the dead. The related verb katoikeō is used extensively for God's presence: the fullness of deity 'dwells' (katoikei) in Christ (Colossians 2:9), and God's Spirit 'dwells' in believers (Romans 8:11).
The single NT use of katoikēsis in Mark 5:3 is striking: the demon-possessed man's permanent dwelling was a graveyard — among the dead, unclean, bound, crying out and cutting himself. This is the demonic counterfeit of katoikēsis: a dwelling among death rather than life. When Jesus restored him, he was found 'sitting, dressed and in his right mind' (Mark 5:15) — a new habitation in sanity and dignity. The theology of dwelling runs throughout Scripture from the Garden (God walking with humanity) to Revelation 21:3 ('Now the dwelling (skēnē) of God is with humans'). Where we dwell reveals what or who we belong to.