1 noun LING mother tongueteanga dhúchais c m ucéad teanga c m uIrish is his first languageis í an Ghaeilge a theanga dhúchais, le Gaeilge a tógadh é2 noun main or official languagecéad teanga c m uEnglish is the first language in that countryis é an Béarla an chéad teanga sa tír sin