Definitions:

1. a periodical that is published every quarter, or four issues per year noun
   • My favorite art magazine is a quarterly publication.
2. in diagonally opposed quarters of an escutcheon adverb
   • two coats of arms borne quarterly
3. in three month intervals adverb
   • interest is compounded quarterly
4. of or relating to or consisting of a quarter adjective
   • quarterly report

Synonyms:

• every quarter