in an extreme degree; exceedingly: extremely cold.

1525–35; extreme + -ly

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World English Dictionary
extremely (ɪkˈstriːmlɪ)
1.  to the extreme; exceedingly
2.  (intensifier): I behaved extremely badly

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1530s, from extreme. Originally "with great severity," late more loosely, "in extreme degree" (1570s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Math concepts are extremely difficult to convey, while explaining .
Your job is extremely fulfilling.
Jim is known to be extremely calm and focused under pressure.
This will be extremely useful in a number of ways.
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