This is the 230th most frequent Romanian word.
daca
"If."
In this sentence, "dacă" is a conjunction introducing a conditional clause, expressing "if".
Dacă mergi la magazin, adu-mi o sticlă de lapte.
If you go to the store, bring me a bottle of milk.
Here, "dacă" is used to introduce an indirect question, meaning "if" or "whether".
Mă întreb dacă el va veni la petrecere.
I wonder if he will come to the party.
In this context, the word "dacă" again serves as a conjunction introducing a condition, "if".