Emphanes means visible, manifest, or openly apparent — literally 'appearing in' or 'showing forth.' It appears twice in the NT: Acts 10:40 describes God making Jesus 'visible [emphane]' after the resurrection, and Romans 10:20 quotes Isaiah: 'I revealed myself to those who did not ask for me; I was found by those who did not seek me.'
The word captures the theological breakthrough of resurrection: Jesus did not remain hidden after rising but was made emphanes — openly visible, to chosen witnesses (Acts 10:41). The restriction of post-resurrection appearances to specific witnesses (not the general public) is itself significant — God's self-revelation is purposeful and personal, not broadcast indiscriminately. Romans 10:20 uses emphanes language in the context of Gentile inclusion: God's surprising self-revelation to those who were not seeking Him — the nations — fulfills Isaiah's prediction and grounds the Gentile mission. Divine disclosure is always a gracious initiative, not a human achievement.