This is the 5006th most frequent Turkish word.
gittiler
"They went."
'Gittiler' indicates the third person plural subject (they) performed the action of going in the past tense.
Onlar dün sinemaya gittiler.
Yesterday, they went to the cinema.
'Gittiler' refers to the students collectively performing the action of leaving, also in the past tense, emphasizing a sequential departure.
Bütün öğrenciler sırayla gittiler.
All the students went one by one.
The word 'gittiler' demonstrates the action was completed in the past by a group leaving the meeting.