Thousandth

1. n. The quotient of a unit divided by a thousand; one of a thousand equal parts into which a unit is divided.
2. a. Next in order after nine hundred and ninty-nine; coming last of a thousand successive individuals or units; — the ordinal of thousand; as, the thousandth part of a thing.
3. a. Constituting, or being one of, a thousand equal parts into which anything is divided; the tenth of a hundredth.
4. a. Occurring as being one of, or the last one of, a very great number; very small; minute; — used hyperbolically; as, to do a thing for the thousandth time.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.