to make a public declaration about something

घोषणा करना

English Usage: They will announce the winner of the competition tomorrow.

Hindi Usage: वे कल प्रतियोगिता के विजेता की घोषणा करेंगे।

a formal public statement about a fact, occurrence, or intention

उद्घोषणा

English Usage: The company made an important announcement regarding its new product.

Hindi Usage: कंपनी ने अपने नए उत्पाद के बारे में एक महत्वपूर्ण उद्घोषणा की।

having been made publicly known

घोषित

English Usage: The announced policy changes will take effect next month.

Hindi Usage: घोषित नीति में परिवर्तन अगले महीने से प्रभावी होंगे।