Definitions of Spartan:

• noun:   a resident of Sparta
• adjective:   resolute in the face of pain or danger or adversity

  Example: "Spartan courage"

• adjective:   of or relating to or characteristic of Sparta or its people
• adjective:   unsparing and uncompromising in discipline or judgment

  Example: "A Spartan upbringing"

• adjective:   practicing great self-denial

  Example: "A spartan diet"