Either side of a triangle distinguished from the base or, in a right triangle, from the hypotenuse; also, an indefinitely extending branch of a curve, as of a hyperbola.

In a right triangle, a side that is not the hypotenuse

Either of the two sides that form the right angle in a right triangle.

A "leg" is simply a way to describe the two sides of your business... just like a person standing on two legs.

on or towards the half of the field on the same side as the batsman's legs as he stands in the batting stance; synonym for on. the leg stump.

the sides adjacent to the right angle of a triangle.

In a right triangle, the legs of the triangle are the two sides that are perpendicular to each other, as opposed to the hypotenuse. The ratio of the lengths of the legs defines the trigonometric functions tangent and cotangent of the angles in the triangle. In a right triangle, the length of the leg is also the geometric mean between the length of the segment cut by the altitude to the hypotenuse and the length of the whole hypotenuse.