The Collaborative International Dictionary of English v.0.48:
Solemnize \Sol"em*nize\, v. t. [imp. & p. p. Solemnized; p.
pr. & vb. n. Solemnizing.] [Cf. F. solemniser,
1. To perform with solemn or ritual ceremonies, or according
to legal forms.
Baptism to be administered in one place, and
marriage solemnized in another. --Hooker.
2. To dignify or honor by ceremonies; to celebrate.
Their choice nobility and flowers . . .
Met from all parts to solemnize this feast.
3. To make grave, serious, and reverential.
Wordsworth was solemnizzed and elevated by this his
first look on Yarrow. --J. C.
Every Israelite . . . arose, solemnized his face,
looked towards Jerusalem . . . and prayed. --L.