The word or rational principle — used in Greek philosophy for the ordering principle of the universe and in John 1 for the eternal Son of God. John's prologue is a deliberate engagement with both Jewish and Greek thought.
John's use of logos bridges Jewish wisdom literature (Prov 8) and Greek philosophy, declaring that the eternal rational principle has become flesh. Every use of 'word' in Scripture participates in this concept.
John's logos Christology is the NT's most philosophically sophisticated claim: the divine rational principle that structures reality is a person — Jesus of Nazareth. This became the foundation of Christian engagement with Greek philosophy.