Definitions of bracket:

• noun:   an L-shaped support projecting from a wall (as to hold a shelf)
• noun:   either of two punctuation marks ([ or ]) used to enclose textual material
• noun:   a category falling within certain defined limits
• noun:   either of two punctuation marks (`<' or `>') sometimes used to enclose textual material
• verb:   classify or group
• verb:   place into brackets

  Example: "Please bracket this remark"

• verb:   support with brackets

  Example: "Bracket bookshelves"

• name:  A surname (very rare: popularity rank in the U.S.: #65408)