noun, feminine/peɾjodiθiˈdad/plural: periodicidades
periodicidad is feminine in Spanish.
regularity
“Pujol publicaba sus reflexiones con periodicidad en el boletín de su fundación, el Centro de Estudios Jordi Pujol.” — Pujol publishes his reflections regularly in the newsletter of his foundation, the Jordi Pujol Center for Studies.
From periódico + -idad.