anniversary
US /ˌæn.əˈvɝː.sɚ.i/
UK /ˌæn.əˈvɝː.sɚ.i/

1.
ulang tahun, hari jadi
the date on which an event took place in a previous year, especially one of historical or institutional importance
:
•
Today marks the 50th anniversary of the company's founding.
Hari ini menandai ulang tahun ke-50 berdirinya perusahaan.
•
They celebrated their wedding anniversary with a romantic dinner.
Mereka merayakan ulang tahun pernikahan mereka dengan makan malam romantis.