1 (mathematics数学) a measurement or a quantity that has both size and direction 矢量；向量 Scalars provide information about size (magnitude) such as distance, speed, mass, etc. Vectors provide two pieces of information (magnitude and direction) such as velocity, acceleration, force, etc. 纯量(scalar)提供有关大小（数量）的信息，如距离、速率、质量等。矢量(vector)提供两方面的信息（数量及方向），如速度、加速度、力等。

2 (medical医学) an insect, etc that carries a particular disease from one living thing to another （昆虫等）传病媒介: Mosquitoes are the vectors in malaria. 蚊子是传播疟疾的媒介。

3 (technical术语) the course taken by an aircraft （飞机的）航线