This is the 11787th most frequent Russian word.
законодательных
"Legislative."
The word "законодательных" (legislative) is used as an adjective modifying "изменений" (changes) to describe their nature as related to laws or legislation.
Законодательных изменений требует новая реформа.
Legislative changes are required by the new reform.
Here, "законодательных" modifies "инициатив" (initiatives) to specify that the initiatives pertain to legislation.
В заседании обсуждали вопросы законодательных инициатив.
During the session, they discussed issues of legislative initiatives.
In this sentence, "законодательных" describes "решений" (decisions), indicating their connection to legislating or legal rules.