Definitions of slate:

• noun:   (formerly) a writing tablet made of slate
• noun:   a list of candidates nominated by a political party to run for election to public offices
• noun:   a fine-grained metamorphic rock that can be split into thin layers
• noun:   thin layers of rock used for roofing
• verb:   enter on a list or slate for an election

  Example: "He was slated for borough president"

• verb:   designate or schedule

  Example: "He slated his talk for 9 AM"

• verb:   cover with slate

  Example: "Slate the roof"

• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #6150)