Spartan may be used as an adjective that means marked by strict self-discipline. It may also be used as a noun that refers to a person of strict discipline.
Our word of the day’s first meaning was as a reference to any resident of the ancient Greek city-state Sparta. Sparta was known for having a highly disciplined way of life for all of its citizens — men and women — to keep them ready for war at any time.
In modern times, the word can be a noun that refers to a person with a strict sense of discipline. Here’s an example of the word used in adjective form: As much as I’d love to have a body that resembles Tony’s, his Spartan lifestyle intimidates me. I don’t think I have the discipline needed to engage in as much exercise as he does.