Pattern is an Irish term meaning either a saint's feast day, or the various devotional activities that take place on the feast day at sites associated with the saint's life. It is thought to derive from the word patron, as in a patron saint.

A notable example of a pattern takes place on the eve and day of July 24 at Saint Declan's Ardmore, County Waterford.

Reference

Ó Cadhla, Stiófan (2002). The Holy Well Tradition: The Pattern of St. Declan, Ardmore, County Waterford 1800-2000 (Maynooth Studies in Local History, Number 45). Dublin: Four Courts Press Ltd. ISBN 1-85182-706-4.