To bisect something means to divide it into two equal parts.

In geometry, when you bisect a line segment, you cut it at its exact midpoint so both halves are perfectly equal. If you bisect an angle, you draw a line through it that splits it into two identical angles. A teacher might ask you to bisect a 60-degree angle, which means dividing it into two 30-degree angles.

You can bisect other things too. A river might bisect a town, running right through the middle and dividing it into east and west sides. A hiking trail could bisect a forest. When something bisects something else, it cuts through and splits it into two equal parts.

The key idea is equal division. If you cut an apple into two pieces but one piece is much bigger than the other, you haven't truly bisected it. You've just cut it unevenly. True bisection means both parts are the same size, like folding a piece of paper so the edges match up perfectly before making your crease.