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In a sentence
Starosta slávnostne otvoril výstavu.
The mayor ceremonially opened the exhibition.
Slávnostne sme si pripili na zdravie.
We solemnly toasted good health.
Deti boli slávnostne oblečené.
The children were dressed formally.
Cenu jej odovzdali slávnostne.
They presented the award to her ceremonially.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.