| Mach | Austrian physicist and philosopher who introduced the Mach number and who founded logical positivism (1838-1916) |
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| Mach | the ratio of the speed of a moving body to the speed of sound |
| Mach | wildflowers of western North America |
| Mach | wild aster having leafy stems and flower heads with narrow bright reddish-lavender or purple rays |
| Mach | wild aster with fernlike leaves and flower heads with very narrow bright purple rays |
| Mach | wild aster having grayish leafy stems and flower heads with narrow pale lavender or violet rayes |
| Mach | a large heavy knife used in Central and South America as a weapon or for cutting vegetation |
| Mach | a statesman of Florence who advocated a strong central government (1469-1527) |
| Mach | of or relating to Machiavelli or the principles of conduct he recommended |
| Mach | the political doctrine of Machiavelli: any means (however unscrupulous) can be used by a ruler in order to create and maintain his autocratic government |
| Mach | supply with projecting galleries |
| Mach | a projecting parapet supported by corbels on a medieval castle |