四し元げん速そく度ど

Meanings

1

noun

four-velocity

physics

Technical term in relativity; the four-vector analogue of velocity in Minkowski spacetime.

degrees, occurrence, time

四し元げんベクトル
General term for a four-vector; 四元速度 is a specific instance of a four-vector representing velocity.
速そく度ど
Ordinary three-dimensional velocity; 四元速度 extends this concept to four-dimensional spacetime.

Compound of 四元 (four-dimensional) and 速度 (velocity), directly translating the English physics term 'four-velocity'.