1) Sole 2) The outer sole of a shoe 3) Treaded shoe part 4) Treaded sneaker part 
• (n.) The outside sole of a boot or shoe.
The bottom of the shoe that touches the ground as you walk.
the outer sole of a shoe or boot oxford a low shoe laced over the instep.
Out'sole` noun The outside sole of a boot or shoe. 
The bottom-most layer of most running shoes; the layer that contacts the ground and provides traction
[n] - the outer sole of a shoe or boot
noun the outer sole of a shoe or boot that is the bottom of the shoe and makes contact with the ground
The material, usually made of hard carbon rubber, on the bottom of most running shoes; the layer of the shoe that contacts the ground.
The very bottom of the shoe, the part that contacts the ground. 
The bottom of the shoe that touches the ground
The sole of the shoe that provides grip and protection. 
the outer sole of a shoe.