The Greek verb gnōrizō (γνωρίζω) means to make known, reveal, or declare — to bring something from hidden to known. It is used of God making His will known, of the gospel being proclaimed, and of believers making known the mystery of Christ. It differs from ginōskō (to know) in its causative sense: not just knowing but making others know.
Gnōrizō is one of the great revelation words of Scripture. God has not kept Himself hidden: He gnōrizōs His ways, His salvation, His mystery. Paul's doxology in Romans 16:26 celebrates the mystery 'now disclosed and through the prophetic writings made known to all nations.' Ephesians 3:3-5 uses gnōrizō for the revelation of the mystery of the gospel to Paul. The entire missionary enterprise is an act of gnōrizō — making known what was hidden, declared what was unknown. Believers are called to be agents of this divine revelation.