This is the 12523rd most frequent Russian word.
коллективный
Collective.
The word 'коллективный' here describes work performed collectively or by a group, emphasizing teamwork and shared efforts.
Коллективный труд помогает быстрее достигать целей.
Collective work helps achieve goals faster.
In this sentence, 'коллективный' modifies 'собрание' (meeting) to denote that the meeting involved a group or collective participation.
Решение было принято на коллективном собрании.
The decision was made at the collective meeting.
Here, 'коллективного' describes the effort, suggesting that it was a joint endeavor involving multiple individuals or a group.