Divides something into two equal parts, usually by cutting or drawing a line through the middle.
From Latin 'bi-' (two) and 'secare' (to cut). The word evolved in the 17th century as geometry developed, combining the prefix meaning 'two' with the root for cutting.
When you bisect an angle in geometry, you're literally doing what carpenters and architects have done for thousands of years—finding the exact middle point. The Romans understood this concept so well they built it into their word for it.
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