Platos (πλάτος) means breadth or width. It refers to the horizontal extent or expanse of something. In the NT it appears in contexts describing both physical dimensions (the New Jerusalem) and spiritual realities (the vastness of Christ's love). It belongs to the word family of platys (G4116, broad).
Paul's prayer in Ephesians 3:18 is one of the most expansive prayers in Scripture: that believers may grasp the "breadth and length and height and depth" of the love of Christ. The platos (breadth) of Christ's love suggests its universal reach — extending to every nation, tongue, and people. No one is beyond the width of God's saving grace. In Revelation 20:9, platos describes the breadth of the earth across which Gog and Magog march. In Revelation 21:16, it measures the New Jerusalem — a perfect cube of 12,000 stadia, echoing the Holy of Holies. The four dimensions Paul lists in Ephesians surpass human comprehension, pointing to a love that can be experienced but never exhausted or fully measured.