periodicalPronunciation: /pɪərɪˈɒdɪk(ə)l/Translate periodical | into French | into German | into Italian | into Spanish Definition of periodical noun a magazine or newspaper published at regular intervals. adjective [attributive] occurring or appearing at intervals; occasional:she took periodical gulps of her tea (of a magazine or newspaper) published at regular intervals:Britain’s best periodical art magazineDerivatives periodically adverb periodical in other Oxford dictionaries Definition of periodical in the US English dictionary