proclaim
v.v. to announce something important in a public or official way. You use this when someone wants everyone to know a new rule, a victory, or a strong belief.
v. to announce or declare something officially, publicly, or emphatically. Often implies a formal or authoritative context, though it can describe a passionate personal declaration.
The government will proclaim a new national holiday tomorrow.
The protesters gathered in the square to proclaim their right to free speech and fair treatment.
After years of civil unrest, the newly elected leader stood before the crowd to proclaim a new era of peace and economic cooperation.
From Middle English proclamen, proclaime, from Old French proclamer, from Latin prōclāmō, prōclāmāre, from prō- (“forth”) + clāmō (“to shout, cry out”). Spelling altered by influence of claim, from the same Latin source (clāmō).
The verb is transitive and often takes a direct object or a 'that' clause.