Homoiousia is a Greek word that means "of similar substance." It is a theological term often used in Christian discussions regarding the Trinity and the nature of Jesus Christ. Some synonyms for homoiousia include homogeneity, similarity, and resemblance. In the context of Christianity, the concept of homoiousia involves the belief that God the Father, God the Son, and God the Holy Spirit are all of the same substance, but distinct in their persons. This doctrine is central to the Trinitarian understanding of God and is a crucial aspect of Christian theology. Other synonyms for homoiousia might include likeness, sameness, and correspondence.