Periodical refers to something that occurs or happens repeatedly at regular intervals. It can also refer to a publication, such as a magazine or newspaper, that is published at fixed intervals, such as weekly or monthly. Full definition
What type of cases might make use of Periodical Payment Orders (PPOs)? (lawyer-monthly.com)
The policyholder has an option to receive the maturity benefit in periodical payments for five years after the date of maturity rather than as a lump sum, with the Settlement option. (policybazaar.com)
A number of classics were actually published in serial form in periodicals in their day, with dedicated readers eager to purchase the next installment as the author wrote it. (goodereader.com)