1. 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.
2. Constituting, or being one of, a thousand equal parts into which anything is divided; the tenth of a hundredth.
3. 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.
Thou·sandth, n. The quotient of a unit divided by a thousand; one of a thousand equal parts into which a unit is divided.
adj : the ordinal number of one thousand in counting order [syn: 1000th]
n 1: position 1,000 in a countable series of things
2: one part in a thousand [syn: one-thousandth]