Definition:Major Arc

Definition
Let $a$ and $b$ be points on the boundary $\BB$ of a simple closed curve $\CC$ in the plane.

Let $a$ and $b$ divide $\BB$ into unequal parts.

The longer of the arcs described by $a$ and $b$ is referred to as the major arc of $\BB$.

Major Arc of Circle

 * Circle.png

Also see

 * Definition:Minor Arc