Source : Webster's Revised Unabridged Dictionary (1913)

Extremely \Ex*treme"ly\, adv.
   In an extreme manner or state; in the utmost degree; to the
   utmost point; exceedingly; as, extremely hot or cold.

Source : WordNet®

extremely
     adv 1: to a high degree or extent; favorably or with much respect;
            "highly successful"; "He spoke highly of her"; "does
            not think highly of his writing"; "extremely
            interesting" [syn: {highly}]
     2: to an extreme degree; "extremely cold"; "extremely
        unpleasant"
     3: to an extreme degree; "the house was super clean for
        Mother's visit" [syn: {super}]
     4: to an extreme degree or extent; "his eyesight was
        exceedingly defective" [syn: {exceedingly}, {passing}]