This is the 14284th most frequent Russian word.
отборочного
"Отборочного" means "selection" or "qualifying" (adjective).
The word 'отборочного' is used as an adjective describing the stage ('этап') of a competition, indicating that it serves the purpose of selection or qualification.
Отборочного этапа соревнований было сложно пройти.
The qualifying stage of the competition was difficult to pass.
Here, 'отборочного' describes the match ('матч'), specifying its function as a preliminarily selective game.
Тренер сильно волновался перед отборочным матчем.
The coach was very nervous before the qualifying match.
In this sentence, 'отборочного' modifies the tour ('тур'), referring to a segment or round aimed at selection or qualification.