noun

• (uncountable) Solid residue from roasting coal in a coke oven; used principally as a fuel and in the production of steel and formerly as a domestic fuel.
  "The plant should produce approximately 550,000 tons of screened blast furnace coke per year."

verb

• (transitive) To produce coke from coal.
• (intransitive) To turn into coke.
• (especially automotive, astronautics) To add deleterious carbon deposits as a byproduct of combustion.
  "In kerolox engines, some of the fuel flow cokes in the engine's cooling passages over time, requiring thorough cleaning prior to reuse."

noun

• (informal, slang, uncountable) Cocaine.

noun

• (uncountable, informal) Alternative letter-case form of Coke (cola-based soft drink, especially Coca-Cola).
• (countable, informal) Alternative letter-case form of Coke (a serving of cola-based soft drink, especially Coca-Cola).
• (US, chiefly Southern US, New Mexico, informal) Alternative letter-case form of Coke (any soft drink, regardless of type).