This is the 762nd most frequent Estonian word.
töötanud
"Worked" (past participle of "work").
In this context, 'töötanud' expresses an activity done frequently or intensively, paired with a purpose or consequence.
Olen töötanud väga palju, et saavutada oma eesmärgid.
I have worked very hard to achieve my goals.
Here, 'töötanud' is used in a past perfect tense to show an action completed before another action in the past.
Ta oli töötanud mitmetes kohtades, enne kui ta siia tuli.
He had worked at several places before coming here.
In this sentence, 'töötanud' is the past participle of 'töötama', used to describe a completed action within a present perfect tense construction.