The Greek noun basis literally means a base, step, or foot — the foundational part that enables standing or walking. In the New Testament it appears once, in Acts 3:7, where Peter takes the lame man by the hand and immediately 'his feet and ankles became strong' — literally, his bases (feet) were strengthened. The word emphasizes the foundational, weight-bearing function of the foot.
The healing of the lame man in Acts 3 is the first miracle of the church age, immediately following Pentecost. The man had been lame from birth — never having stood on his own basis. His miraculous healing at the Beautiful Gate declared that the resurrection power of Jesus Christ was now at work through the apostles. The man leaping and praising God pictured the joy of the redeemed walking in new life.