The adjective chiytsown means outer or external, contrasted with inner (penimiy). It is used most extensively in Ezekiel's Temple vision to describe the outer court (chatser hachiytsownah), where the general Israelite population gathered, as opposed to the inner court reserved for priests.
The distinction between outer and inner courts in Ezekiel 40–48 maps the graduated holiness of God's presence — the closer to the divine glory, the more restricted the access. This spatial theology of holiness shapes the New Testament's understanding of Jesus as the one who tears down the dividing wall (Ephesians 2:14), granting all believers direct access past the outer courts and through the veil into God's very presence. The 'outer darkness' (Matthew 8:12; 22:13) draws on the same contrast: exclusion from the light of God's presence.