1. Of a serious, thoughtful, important consideration, or mood: When Jeremy was told about his friend's accident, he had a solemn look on his face.

The church organist played solemn music which caused many in the congregation to think deeply about their lives.

Usually a judge in court is a solemn figure who receives attention and respect.

2. Relating to something which is done with form and ceremony: There was a solemn procession at the funeral for the minister of the church who had a heart attack.

3. Conveying a sincere promise: Adam and Evelyn made a solemn promise to love each other forever.

As an alcoholic for years, Henry made a solemn decision and promise to his wife never to drink liqueur again.

4. Etymology: from Old French solemne, which came from Latin sollemnis, "customary, formal, ceremonial, traditional" and then "performed with due ceremony on a particular day that has been established".