This is the 5404th most frequent Russian word.
парламентских
"Парламентских" means "parliamentary" in English.
Here, "парламентских" is used as an adjective describing "выборах" (elections), signifying elections related to the parliament.
Парламентских выборах всегда уделяется большое внимание.
Parliamentary elections are always given great attention.
In this sentence, "парламентских" modifies "слушаниях" (hearings), indicating hearings conducted within the parliamentary context.
На парламентских слушаниях обсуждали важные законы.
Important laws were discussed at the parliamentary hearings.
The word "парламентских" here describes "лидеров" (leaders), implying leaders associated with the parliament.