What is the meaning of straightaway?

noun

• A straight segment of a roadway or racecourse.
  • synonyms: straight

adjective

• Performed with little or no delay.
  • usage: "an immediate reply to my letter"; "a prompt reply"; "was quick to respond"; "a straightaway denial"
  • synonyms: immediate, prompt, quick

adverb

• Without delay or hesitation; with no time intervening.
  • usage: "he answered immediately"; "found an answer straightaway"; "an official accused of dishonesty should be suspended forthwith"; "Come here now"
  • synonyms: immediately, instantly, straight off, directly, now, right away, at once, forthwith, like a shot