Something that happens quarterly occurs four times per year, like your family's quarterly visit to your grandparents' house in Florida.

Magazines that are published every three months come out quarterly — in fact, they're commonly referred to as quarterlies. For businesses, many things happen on a quarterly schedule, from the quarterly taxes they pay to quarterly reports sent to shareholders. Think of a year as consisting of four quarters; anything occurring once per quarter happens quarterly. The Latin root, quartus, means "the fourth."

Definitions of quarterly
  1. adjective
    of or relating to or consisting of a quarter
    quarterly report”
  2. adverb
    in three-month intervals
    “interest is compounded quarterly
    synonyms: every quarter
  3. noun
    a periodical that is published every quarter (or four issues per year)
    see moresee less
    type of:
    serial, serial publication, series
    a periodical that appears at scheduled times
  4. adverb
    in diagonally opposed quarters of an escutcheon
    “two coats of arms borne quarterly
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