A bisector is something that cuts an object into two equal parts. It is applied to angles and line segments.
In verb form, we say that it *bisects* the other object.

A line that cuts an angle into two equal parts.
In the figure below the blue line bisects the angle LJM. The blue line is the *bisector*.
For more on this see Angle bisector.

A line which cuts another line segment into two equal parts. In the figure below, the line segment AB is the bisector. It bisects the line PQ - dividing it into two equal parts. For more on this see Line bisector.

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