quarterly

Adjective
  1. Of or relating to or consisting of a quarter (synset 303009554)
    "quarterly report"
Noun
  1. A periodical that is published every quarter (or four issues per year) (synset 106606829)
Adverb
  1. In diagonally opposed quarters of an escutcheon (synset 400438873)
    "two coats of arms borne quarterly"
  2. In three month intervals (synset 400438741)
    "interest is compounded quarterly"

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