This is the 26th most frequent Romanian word.
cel
"Cel" in Romanian means "the one" or "that one," and is used as a demonstrative pronoun or article.
Here, 'cel' is used as a determiner in a superlative construction to refer to 'the most beautiful'.
Cel mai frumos lucru este iubirea.
The most beautiful thing is love.
In this sentence, 'cel' functions as a pronoun and means 'the one'.
Cel care a venit ieri este colegul meu.
The one who came yesterday is my colleague.
'Cel' here is used as a specific pronoun in a relative clause, referring to a specific item or person discussed.