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| αριθμός Μαχ | |||
| English thesaurus | |||
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| The ratio of the speed of an object to the local speed of sound | |||
| M | |||
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| 4 digit number identifying PSDS input device (MODS report abbreviation) | |||
| Mach number: 12 phrases in 3 subjects |
| Earth sciences | 6 |
| Physical sciences | 2 |
| Transport | 4 |