Etymology
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happily (adv.)

mid-14c., "by chance or accident;" late 14c., "by good fortune, luckily," from happy + -ly (2). Sense of "in pleasant circumstances, with mental pleasure and contentment" is from 1510s. Happily ever after recorded by 1825.

updated on May 21, 2015

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Definitions of happily from WordNet

happily (adv.)
in a joyous manner;
they shouted happily
Synonyms: merrily / mirthfully / gayly / blithely / jubilantly
happily (adv.)
in an unexpectedly lucky way;
happily he was not injured
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.