マッハ

noun

Mach; Mach number

Technical term for the ratio of speed to the speed of sound. Often used in compounds like マッハ数.

See also: マッハ数

• この戦せん闘とう機きはマッハ2で飛ひ行こうできる。

  This fighter jet can fly at Mach 2.

noun

at high speed; very fast

Colloquial use, often as マッハで, meaning 'at breakneck speed' or 'extremely quickly'. Not a precise measurement.

• 彼かれはマッハで宿しゅく題だいを終おわらせた。

  He finished his homework at lightning speed.