ellipse

A closed curve, the locus of a point such that the sum of the distances from that point to two other fixed points (called the foci of the ellipse) is constant; equivalently, the conic section that is the intersection of a cone with a plane

Ellipsis, the removal from a phrase of a word which is grammatically needed, but which is clearly understood without having to be stated.

To remove from a phrase a word which is grammatically needed, but which is clearly understood without having to be stated.

In B's response to A's question:- (A: Would you like to go out?, B: I'd love to), the words that are ellipsed are go out.

A park in Washington, D.C., United States.

A park in Washington, D.C., United States.

A park in Washington, D.C., United States.