| a. | 1. | Next in order after nine hundred and ninty-nine; coming last of a thousand successive individuals or units; - the ordinal of thousand; |
| 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; | |
| n. | 1. | The quotient of a unit divided by a thousand; one of a thousand equal parts into which a unit is divided. |
| Noun | 1. | thousandth - position 1,000 in a countable series of things |
| 2. | thousandth - one part in a thousand Synonyms: one-thousandth | |
| Adj. | 1. | thousandth - the ordinal number of one thousand in counting order Synonyms: 1000th |