Mḗpō (μήπω) means not yet — indicating something anticipated but not yet occurred. Compound of mē (not) + pō (yet).
Romans 9:11 uses mēpō to make a crucial point about election: 'before the twins were born or had done anything good or bad — not yet having done anything — God's purpose in election might stand: not by works but by him who calls.' This is one of the strongest statements of sovereign grace in all Scripture. God's choice preceded all human action. Similarly, Hebrews 12:4 ('you have not yet resisted to the point of shedding your blood') encourages perseverance.