Source : Webster's Revised Unabridged Dictionary (1913)

Highly \High"ly\, adv.
   In a high manner, or to a high degree; very much; as, highly
   esteemed.

Source : WordNet®

highly
     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: {extremely}]
     2: at a high rate or wage; "highly paid workers"
     3: in a high position or level or rank; "details known by only
        a few highly placed persons"