solemnise

verb2

1. •
   To make solemn, or official, through ceremony or legal act.

   • The couple chose to solemnize their relationship in a secular ceremony, instead of having a wedding.
2. •
   To make grave, serious, and reverential.

   • September 27, 1873, John Campbell Shairp, "Wordsworth's Three Yarrows", in Every Saturday Wordsworth was solemnized and elevated by this his first look on Yarrow.