To divide something into two equal parts, usually by drawing a line through the middle.
From Latin 'bis-' (twice) and 'secare' (to cut). The word emerged in mathematics but is now used generally for any division into two equal parts.
The angle bisector is one of the most important constructions in geometry—it's so fundamental that ancient mathematicians could do it with just a compass and straightedge, making it a gateway concept for understanding symmetry.
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