one-millionth
- n one part in a million equal parts
- Nationwide, the group is on track to deliver its one-millionth meal in December.
- Even one-millionth part of fluorine in four daily glasses of water over a period of a year, said dentists, was enough to pit a growing child's teeth for life.
- If I didn't remember how I felt about long division, I'd go berserk some day when I see 'there' and 'their' mixed up for the one-millionth time.