Something that is a starting point for a discussion or process can be used to begin it or act as a basis for it. These proposals represent a realistic starting point for negotiation.
An origin is a beginning or starting point, and, in mathematics, the origin can also be thought of as a starting point. The coordinates for every other point are based on how far that point is from the origin. At the origin, both x and y are equal to zero, and the x-axis and the y-axis intersect.
A graph consists of two axes called the x (horizontal) and y (vertical) axes. These axes correspond to the variables we are relating. In economics we will usually give the axes different names, such as Price and Quantity. The point where the two axes intersect is called the origin.