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extremely - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

From extreme +‎ -ly.

extremely (comparative more extremely, superlative most extremely)

  1. (degree) To an extreme degree.
    • 2015 April 14, “America's First All-Girl Quintuplets Born in Texas Hospital”, in Time‎[1]:

      The National Center for Health Statistics' latest data indicate that quintuplets are extremely rare, with 66 reported sets of five or more babies in 2013.

to an extreme degree