初めて

for the first time

hajimete

Meanings

1
for the first timeadvadj-no
2
only after ... is it ...; only when ... do you ...; not until ... do you ...adv
3
first time; (one's) firstn

JMdict 1342550

１６いちろく歳さいの時とき、初めてはじめてテニスをした。

When I was sixteen, I played tennis for the first time.