Merriam-Webster's Collegiate® Dictionary, 11th Edition
FROLIC
I. adjective
Etymology: Dutch vroolijk, from Middle Dutch vrolijc, from vro happy; akin to Old High German frō happy
Date: 1538
full of fun ; merry ,
II. intransitive verb (frolicked; frolicking)
Date: 1593
to amuse oneself ; make merry, to play and run about happily ; romp , frolicker noun
III. noun
Date: 1616
a playful or mischievous action,
2. an occasion or scene of fun ; party , fun , merriment