This is the 568th most frequent Slovenian word.
gledalcev
"Gledalcev" means "viewers" or "spectators" in English.
Here, 'gledalcev' is in the genitive plural form, used after the quantifier 'veliko'.
Na koncertu je bilo veliko gledalcev.
There were many spectators at the concert.
In this sentence, 'gledalcev' is in the genitive plural form, indicating the group within the nominative case emphasis.
Gledalcev se je zbralo pred vhodom v dvorano.
Spectators gathered in front of the hall entrance.
'Gledalcev' in this context is in the genitive plural form to indicate possession (safety of spectators).