n.
     - a fine-grained grey, green, or bluish-purple metamorphic rock easily split into smooth, flat plates. 
▸a flat plate of slate used as roofing material.
 - a plate of slate formerly used in schools for writing on.
 - a bluish-grey colour.
 - a list of candidates for election to a post or office. 
▸
Brit. a record of a person's debt or credit:
 put it on the slate.
  ▸chiefly N. Amer. a range of something on offer.
 - a board showing the identifying details of a take of a film, held in front of the camera at the beginning and end of the take.
 
v.
   - cover (a roof) with slates.
 - Brit. informal criticize severely.
 - chiefly N. Amer. schedule; plan. 
▸nominate as a candidate for an office or post.
 
 
  Derivative
  
  Etymology
  ME sclate, sklate, shortening of OFr. esclate, fem. synonymous with esclat (see slat).