three years; triennial / three years old

three years of age, three years old

(mineralogy) ulexite

“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds

the Czech Republic

the Republic of the Congo

the Republic of South Africa

(country) The Republic of Poland

Republic of Iceland (official name)

Republic of Benin, shortly Benin - (a country in Western Africa)