No, it is defined by its location. It is an entitity without any dimensions, but may be identified in space by an appropriate number of coordinates.
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point , line and plane
In Euclidean geometry point, line and plane are not defined.
A set can be defined or undefined.
The three undefined terms are the point,the line and the plane.
A term that is undefined mean simply that it is not defined. The prefix un means not, and if you add it to the word defined, ta da, you get undefined.