Asseverate is a verb that means to declare earnestly or solemnly.

Asseverare (ah SAY ver are ay) is a Latin word that means ‘assert’ or ‘declare.’ Our word of the day could be thought of simply as a synonym of ‘stated’ or ‘said,’ but asseverate is a more formal term than that. It is often used in legal or governmental contexts. For example:

The government officials will hold a press conference this afternoon. They are expected to asseverate a sincere effort to find those responsible for the bribery. About two years ago, they made the very same solemn declaration.