Mettle

 WORD OF THE DAY

mettle / noun / MET-ul

Definition
1a: vigor and strength of spirit or temperament
1b: staying quality
1c: stamina
2a: quality of temperament or disposition
2b: aroused to do one's best

Examples
"Recently, 23 of Watauga's best math students met virtually to test their mettle against their peers in the annual MathCounts competition—a contest that tasks young mathematicians to tackle challenging math problems in a timed tournament format."
— The Blowing Rocket (Blowing Rock, North Carolina), 22 Apr. 2021

Tour officials limited capacity to just 20%, but the spectators still were a welcome sight to Thomas and more than enough to test his mettle.
— Edgar Thompson, orlandosentinel.com, 15 Mar. 2021

Did You Know?
Originally, mettle was simply a variant spelling of the word metal (which dates to at least the 13th century), and it was used in all of the same senses as its metallic relative.
Over time, however, mettle came to be used mainly in figurative senses referring to the quality of someone's character.
It eventually became a distinct English word in its own right, losing its literal sense altogether.
Metal remained a term primarily used for those hard, shiny substances such as steel or iron, but it also acquired a figurative use.
Today, both words can mean "vigor and strength of spirit or temperament," but only metal is used of metallic substances.