Questions & Answers about Repetiția începe azi.
Because -a at the end is the definite article attached to the noun.
In Romanian, instead of putting a separate word like the before the noun, you usually add the article to the end:
- repetiție = a rehearsal
- repetiția = the rehearsal
So Repetiția începe azi. literally means The rehearsal starts today.
Repetiție is a feminine noun. That matters because the form of the attached definite article depends on gender and number.
For this noun:
- singular indefinite: o repetiție = a rehearsal
- singular definite: repetiția = the rehearsal
So the -a ending here is the normal feminine singular definite ending.