MachMach /mæk $ mɑːk/ noun [uncountable] 
a unit for measuring speed, especially of an aircraft, in relation to the speed of sound. Mach 1 is the speed of sound, Mach 2 is twice the speed of sound etc: 
a plane with a maximum speed of Mach 3
a unit for measuring speed, especially of an aircraft, in relation to the speed of sound. Mach 1 is the speed of sound, Mach 2 is twice the speed of sound etc: a plane with a maximum speed of Mach 3- connivance
- connive
- conniving
- connoisseur
- connotation
- connotative
- connote
- connubial
- conquer
- conquering
- conqueror
- conquest
- conquistador
- Conrad, Joseph
- Conrail
- Conran, Sir Terence
- consanguinity
- conscience
- conscience-stricken
- conscientious
- conscientiously
- conscientiousness
- conscientious objector
- conscious
- consciously