from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The hour before the stock market closing on the third Friday of March, June, September, or December, when both options and futures on stock indices expire, known for its high trading volume and volatile prices in futures, options, and underlying securities.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The final hour of trading during which three types of derivatives contracts expire.
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