Definition 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: designate or schedule
"He slated his talk for 9 AM."
verb: cover with slate
"Slate the roof."
verb: enter on a list or slate for an election
"He was slated for borough president."