three years; the third year / (education) the third school year / (figuratively) a long period of time, several years

three years; triennial / three years old

(anatomy) a secondary sex characteristic

second (2nd), number two

a fountain pen

to continue / to happen consecutively, continue in a row / to lead to / to succeed, follow after

(archaic) to continue / (archaic) to occur immediately or instantly / (archaic) to chronicle / (archaic) to connect

sequel; continuation

two, 2 / second

a great war, a great battle