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When:

Lookups on Merriam-Webster.com spiked on October 13, 2010.

Why:

The joyous celebration of one of the 33 miners rescued in Chile.

When he reached the surface after 69 days underground, Mario Sepulveda led the ecstatic crowd in a patriotic cheer. He quickly became known as "Super Mario," and many news stories described him as ebullient.

Ebullient means "showing liveliness and enthusiasm." It comes from the Latin word meaning "to bubble or boil."