Abarim Publications' online Biblical Greek Dictionary
The noun χιλιοι (chilioi) means a thousand (2 Peter 3:8, Revelation 11:3, 12:6, 14:20, 20:2-7). It has one true derivation, namely the noun χιλιας (chilias), denoting a group of a thousand items; a chiliad (Luke 14:31, Acts 4:4, 1 Corinthians 10:8), but it's also part of the following compound words:
- Together with adverb δις (dis), which comes from the cardinal number δυο (duo), meaning two, and which means twice: the cardinal number δισχιλιοι (dischilioi), meaning two thousand (Mark 5:13).
- Together with the adverb επτακις (heptakis), which means seven-fold and which derives from επτα (hepta), meaning seven: the cardinal number επτακισχιλιοι (heptakischilioi), meaning seven thousand (Romans 11:4).
- Together with the cardinal number πεντε (pente), meaning five: the cardinal number πεντακισχιλιοι (pentakischilioi), meaning five thousand (Matthew 14:21, Luke 9:14, John 6:10).
- Together with a derivation of the cardinal number τετρα (tetra), meaning four: the cardinal number τετρακισχιλιοι (tetrakischilioi), meaning four thousand (Matthew 15:38, Mark 8:9, Acts 21:38).
- Together with adverb τρις (tris), meaning trice, which derives from τρεις (treis), meaning three: the cardinal number τρισχιλιοι (trischilioi), meaning three thousand (Acts 2:41 only).
- Together with the verb αρχω (archo), meaning to rule or command: the noun χιλιαρχος (chiliarchos), denoting the commander of a thousand troops (Mark 6:21, Acts 21:31-37, Revelation 6:15).