This is the 12073rd most frequent Russian word.
идейными
"Iдейными" means "ideological" or "driven by ideas" in English.
In this sentence, 'идейными' is used to describe leaders who are driven by or majorly associated with a specific idea or ideology, highlighting their motivational role based on ideas.
Мы встретились с идейными лидерами движения.
We met with the ideological leaders of the movement.
Here, 'идейными' qualifies 'основаниями,' indicating that the foundation is conceptual or based on a set of ideas or beliefs.
Этот подход считается идейными основами нашей организации.
This approach is considered the ideological foundation of our organization.
In this context, 'идейными' describes individuals who adhere to and act strongly in accordance with their ideas or ideals, implying commitment and passion.