April UK /ˈeɪ.pɹɪl/US /ˈeɪ.pɹəl/ noun1 •The fourth month of the Gregorian calendar, following March and preceding May.As of April 26, the US ranked 22nd in the number of tests performed per capita, according to the Organization for Economic Co-operation and Development (OECD). — 2020 formsAprils