solemn /solˈəm/

1. Attended with or marked by special (esp religious) ceremonies, pomp, or gravity
2. Attended with an appeal to God, as an oath
3. Grave
4. In serious earnestness
5. With formal dignity
6. Awed
7. Awe-inspiring
8. Stately
9. Pompous
10. Glum
11. Sombre

solemnify /sə-lemˈni-fī/ transitive verb

To make solemn

solemnity /-lemˈni-ti/ noun

1. A solemn ceremony
2. High seriousness
3. Affected gravity

solemnization or solemnisation /sol-əm-nī-zāˈshən/ noun

• braininesses
• braining
• brainish
• brainless
• brainlessly
• brainlessness
• brainlessnesses
• brain-pan
• brainpan
• brainpans
• brainpower
• brainpowers
• brains
• brainsick
• brainsickly
• brainsickness
• brainsicknesses
• brainstem
• brainstems
• brainstorm
• buccinatory
• Buccinum
• bucellas
• bucellases
• Bucentaur