Volatile

WORD OF THE DAY

volatile /adjective / VAH-luh-tul 
 
Definition
1a: characterized by or subject to rapid or unexpected change
1b: unable to hold the attention fixed because of an inherent lightness or fickleness of disposition
2a: tending to erupt into violence
2b: explosive
2b: easily aroused
2c: lighthearted, lively
3: readily vaporizable at a relatively low temperature
4a: difficult to capture or hold permanently
4b: evanescent, transitory
5: flying or having the power to fly

Examples
Our financial advisor cautioned us to be conservative with our investments while the stock market was still volatile.

"A second round of testing has been ordered for a Massachusetts charter school where elevated levels of toxic chemicals were detected. … Initial testing … found high levels of petroleum and other volatile organic compounds."
— The Associated Press, 8 July 2018

Did You Know?
Volatile was originally for the birds—quite literally. Back in the 14th century, volatile was a noun that referred to birds (especially wild fowl) or other winged creatures, such as butterflies. That's not as flighty as it sounds. 

Volatile traces back to the Latin verb volare, which means "to fly." By the end of the 16th century, people were using volatile as an adjective for things that were so light they seemed ready to fly. 

The adjective was soon extended to vapors and gases, and by the early 17th century, volatile was being applied to individuals or things as prone to sudden change as some gaseous substances. 

In recent years, volatile has landed in economic, political, and technical contexts far flown from its avian origins.