noun

• (uncountable, economics) Already-produced durable goods available for use as a factor of production, such as steam shovels (equipment) and office buildings (structures).
• (uncountable, business, finance, insurance) Money and wealth. The means to acquire goods and services, especially in a non-barter system.
  "He does not have enough capital to start a business."
• (uncountable, politics) The capitalist class; investors considered collectively with respect to their societal (economic, political, cultural, etc.) influence.
  "The markets crashing symbolized capital’s discontent with the tax reforms passed."
• (countable) A city designated as a legislative seat by the government or some other authority, often the city in which the government is located; otherwise the most important city within a country or a subdivision of it.
  "Washington D.C. is the capital of the United States of America."

adj

• (comparable, UK, dated) Excellent.
  "That is a capital idea!"
• (crime) Punishable by, or involving punishment by, death.
  "capital punishment; capital murder"

intj

• (slang, dated) used as an expression of approval, satisfaction, or delight.
  "That's an amazing idea! Capital!"

noun

• (countable, architecture) The uppermost part of a column.
  "But a great wonder of this chamber, and a marvel to behold, was how the capital of every one of the four-and-twenty pillars was hewn from a single precious stone, carved by the hand of some sculptor of long ago into the living form of a monster: […]"