The act of making something official or formal, especially a marriage or a treaty.
Solemnization is a very serious and important thing, like when two people get married or when countries make agreements.
Examples:
The solemnization of their marriage was a beautiful ceremony.
The solemnization of the treaty was a historic event.
The solemnization of the agreement took place in the grand hall.
The solemnization of their friendship was marked by a special handshake.
The solemnization of the peace treaty ended the war.
The solemnization of the law was a big event for the country.