1. being number 1000 in a sequence; coming after 999 others
Usage: ordinal number

1. one of 1000 equal parts of something
2. the person or thing that is number 1000 in a sequence

Examples

• She was the thousandth customer to enter the store today.
• The runner finished in thousandth place.
• A millisecond is one thousandth of a second.
• The measurement was accurate to the nearest thousandth of an inch.
• He celebrated being the thousandth member to join the club.
• The recipe calls for one thousandth of a gram of the rare spice.
• The thousandth anniversary of the city will be celebrated next year.