Definitions of pocket:

• noun:   a small pouch inside a garment for carrying small articles
• noun:   an opening at the corner or on the side of a billiard table into which billiard balls are struck
• noun:   a small isolated group of people

  Example: "They were concentrated in pockets inside the city"

• noun:   a supply of money

  Example: "They dipped into the taxpayers' pockets"

• noun:   (bowling) the space between the headpin and the pins next bnehind it on the right or left

  Example: "The ball hit the pocket and gave him a perfect strike"

• noun:   (anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican)
• noun:   a local region of low pressure or descending air that causes a plane to lose height suddenly
• noun:   a hollow concave shape made by removing something
• noun:   an enclosed space

  Example: "The trapped miners found a pocket of air"

• verb:   put in one's pocket

  Example: "He pocketed the change"

• verb:   take unlawfully