The noun form of metapempō (to send for). A summons, the act of sending for someone. Related to the practice of official summoning in the Roman world.
This word connects to the narratives in Acts where divine summons led to pivotal moments in church history. The concept of being sent for by God — called out of one's current situation into His service — is fundamental to biblical theology. God calls individuals by name and sends them on specific missions, from Abraham to Paul.