1. being number one million in a sequence
Usage: ordinal number

1. one of a million equal parts of something
2. the person or thing that is number one million in a sequence

Examples

• She was the millionth visitor to the museum this year.
• The chance of winning is about one in a millionth.
• He celebrated being the millionth customer at the store.
• The measurement was accurate to the millionth of an inch.
• For the millionth time, please clean your room.
• The millionth digit of pi has been calculated.
• Only a millionth of the light reaches the ocean floor.