This is one Greek word that means joint-heir, co-heir, or fellow-heir. Jesus as God’s SON is heir to everything God owns. Therefore, owning everything, Jesus reigns as King. This goes along with many cultures; the family inheritance goes to the first-born son. Jesus was God’s first-born Son, and everything goes to HIM. Humanly, we say Amen and bow the knee to Jesus. However, God is saying something different. God is saying we are joint heirs with Jesus. This means we own everything Jesus owns. We reign alongside of Jesus. We say one day we will go to heaven. God says, we will not only go to heaven, but we will also reign in heaven with Jesus.