Slate Definition
 slāt 
  slated, slates, slating
  
    noun
  
 
    slates
  
A hard, fine-grained, metamorphic rock, typically formed from shale, that cleaves naturally into thin, smooth-surfaced layers.
 Webster's New World 
A thin piece of slate or slatelike material, esp. one used as a roofing tile or as a tablet for writing on with chalk.
 Webster's New World 
A writing tablet made of a similar material.
 American Heritage 
Slates collectively; slating.
 Webster's New World 
A record of past performance or activity.
 Start over with a clean slate.
 American Heritage 
    adjective
  
 Made of a fine-grained metamorphic rock.
 A slate roof.
 American Heritage 
Of the color slate.
 American Heritage 
    verb
  
 
    slated, slates, slating
  
To cover with slate.
 Webster's New World 
To put on a list or designate, as for candidacy, appointment, engagement, etc.; choose or schedule.
 Webster's New World 
To schedule or designate.
 Our professor has slated the art history lecture for Thursday afternoon; was slated to direct the studio's next film.
 American Heritage 
To punish severely, as by thrashing.
 Webster's New World 
To scold or criticize harshly.
 Webster's New World 
    idiom
  
 
      a clean slate
    
 - a record showing no marks of discredit, dishonor, etc.
 
Webster's New World  
Idioms, Phrasal Verbs Related to Slate
- a clean slate
 
Origin of Slate
-  
Middle English sclate from Old French esclate splinter feminine of esclat slat
From American Heritage Dictionary of the English Language, 5th Edition
 From Old French esclate, from esclat (French éclat).
From Wiktionary
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