Quarterly definition : occurring, done, paid, issued, etc., at the end of every quarter of a year.. See examples of QUARTERLY used in a sentence. Quarterly means occurring or happening four times a year, or relating to a quarter of something. It can be an adjective, adverb, noun or heraldic term. Learn more about its meaning, pronunciation, synonyms and collocations. Learn quarterly meaning , months in a quarter, business use, and payment examples. Simple definitions and clear explanations for students in 2025. QUARTERLY definition : 1. done or produced four times a year: 2. a magazine that is published four times a year 3. done…. Learn more.