The Greek verb ekpleroo is an intensified compound of ek (fully, completely) and pleroo (to fulfill, fill), meaning to bring to complete fulfillment. It appears only once in the NT (Acts 13:33), where Paul announces that God has "fully fulfilled" for them the promise made to the fathers by raising Jesus from the dead.
Ekpleroo's single NT occurrence is in one of Paul's most comprehensive sermons (Acts 13:16-41). He traces Israel's history from the Exodus to David, then declares: God has fully, completely fulfilled the ancient promise by raising Jesus. This is the theology of fulfillment — every covenant, every prophecy, every type was pointing forward to a completion that finally arrived in Christ's resurrection. The prefix ek intensifies: not partial fulfillment, not near-fulfillment, but complete fulfillment. The resurrection of Jesus is the fullness of all that God promised to Abraham, David, and the prophets.