Definition
A line or ray that divides an angle into two equal smaller angles. The bisector passes through the vertex of the original angle and splits it precisely in half.
Plain English
A line that cuts an angle exactly down the middle, making two matching halves.
Context Anchor
Seen in basic navigation, chart work, and geometry used for headings, bearings, and course plotting.
Derivation
From Latin bi- meaning 'two' and secare meaning 'to cut.' A bisector literally 'cuts in two.' Knowing this makes the term self-explanatory whenever you meet it in technical drawings.
Why Pilots Care
Pilots apply angle bisectors to determine headings that lie directly between two courses or radials during navigation and approach planning.
Intuition Check
A bisector is not just any line drawn through an angle. It must divide the angle into two equal parts.
Example Sentence 1
The technician drew the bisector of the angle to find the exact center line for drilling the rivet hole.
Example Sentence 2
To track the most direct path between the inbound and outbound courses, the aircraft flew along the bisector of the angle.