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Definition of: periodical
(pir′ē·od′i·kəl) adjective
1. Pertaining to publications, as magazines, etc., that appear at fixed intervals of more than one day; also, published at regular intervals.
2. Periodic (def. 1).
—noun A publication, usually a weekly, monthly, or quarterly magazine, appearing at regular intervals.
—pe′ri·od′i·cal·ly adverb
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