Esoteric

 WORD OF THE DAY

esoteric / adjective / ess-uh-TAIR-ik

Definition
1a: designed for or understood by those with specific knowledge or training
1b: difficult to understand
2a: limited to a small circle
2b: private, confidential
3: of special, rare, or unusual interest

Examples
The judge's decisions were difficult to parse because they were loaded with esoteric legal terminology.

"It turned out Sanford probably knew more about jai alai … than he did coaching football. But give him credit for guiding the Rebels to 5-7 finishes in 2008 and 2009—and for making a young beat writer's day by acknowledging his esoteric reference to a nearly forgotten game."
— Ron Kantowski, The Las Vegas Review-Journal, 19 Dec. 2020

Did You Know?
The opposite of esoteric is exoteric, which means "suitable to be imparted to the public."
According to one account, those who were deemed worthy to attend the Greek philosopher Aristotle's learned discussions were known as his "esoterics," his confidants, while those who merely attended his popular evening lectures were called his "exoterics."
Since material that is geared toward a target audience is often not as easily comprehensible to outside observers, esoteric acquired an extended meaning of "difficult to understand."
Both esoteric and exoteric started appearing in English in the 17th century; esoteric traces back to ancient Greek by way of the Late Latin esotericus. The Greek esōterikos is based on the comparative form of esō, which means "within."