periodical

1 appearing in parts or numbers that follow regularly a periodical town newsletter that is supported by local advertisers Synonyms episodic (also episodical), serial, serializedRelated Words sequential; successive; periodic, recurrent, recurring, regular

2 occurring or appearing at intervals periodical announcements from airline personnel concerning the delay Synonyms continual, on-and-off, periodic, intermittent, recurrent, recurringRelated Words alternate, alternating, cyclic (or cyclical), rhythmic (or rhythmical), seasonal, serial; aperiodic, erratic, fitful, irregular, occasional, spasmodic, sporadic, spotty, unsteadyNear Antonyms eternal, everlasting, interminable, perpetualAntonyms constant, continuous, incessant, unceasing

3 appearing or occurring repeatedly from time to time periodical visits to the dentist will help keep your teeth healthy Synonyms constant, frequent, habitual, periodic, regular, repeated, steadyRelated Words continual, intermittent, recurrent, recurring; cyclic (or cyclical); around-the-clock, hourly, round-the-clock, 24-7 (or 24/7); chronic, confirmed, inveterate; expected, usualNear Antonyms episodic (also episodical), occasional; unexpected, unusualAntonyms inconstant, infrequent, irregular