1. happening at regular intervals

1. a magazine or journal published at regular intervals

Examples

• The library subscribes to many scientific periodicals.
• She reads several fashion periodicals each month.
• The committee holds periodical meetings every quarter.
• Periodical maintenance is required for all equipment.
• This medical periodical is published monthly.
• The garden needs periodical watering during dry spells.
• Academic periodicals often contain peer-reviewed research.