Added 9 October 2026

intercalary

/ˌɪnt.ɚˈkæl.ɚ.i/ adjective

Latin root: intercalārius Wiktionary

adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about intercalary at Wordnik → Where our words come from →

Having a day or month inserted to make the calendar year correspond to the solar year: "Feb. 29 is an intercalary day".
a leap year is an intercalary year

From Latin intercalārius, from intercalāris, from intercalō, from inter (“among”) + calō (“call out, proclaim”).