A quantity or number expressed by an algebraic term.
variable 变量
- A quantity capable of assuming any of a set of values.
- A symbol, especially ‘x’, ‘y’, or ‘z’, that is used usually in connection with quantifiers to represent individuals in a universe of discourse.
- Computing a named unit of storage that can be changed to any of a set of specified values during execution of a program. (Computer Science)
vector 向量
A quantity that has both direction and magnitude, e.g. force or velocity, usually represented by an arrow.
vertex 顶点
The point where two lines meet to form an angle, especially the point of a triangle or cone opposite the base.
vertical 垂直的
Being or situated at right angles to the horizon; upright. Going straight up or down from a level surface or from top to bottom in a picture, etc.
vertical angles / vertically opposite angles 直角
Two angles formed by two intersecting lines and lying on opposite sides of the point of intersection.
vinculum 插线
A bar drawn over two or more algebraic terms to indicate that they are to be treated as a single term. Such as 
volume 体积
The amount of space that an object or a substance fills; the amount of space that a container has.
vulgar fraction 普通分数
A fraction (= a number less than one) that is shown as numbers above and below a line. Another name for simple fraction or common fraction.
