This is the 1849th most frequent Russian word.
основного
"Основного" means "main" or "basic."
Here, 'основного' is used as an adjective describing 'materials,' indicating primary or main materials.
Основного материала здесь недостаточно для завершения проекта.
The main material here is insufficient to complete the project.
In this sentence, 'основного' specifies 'значения' (meanings), referring to fundamental meanings in a context.
Мы обсудили несколько основного значения слова в контексте.
We discussed several key meanings of the word in context.
Here, 'основного' qualifies 'принципа,' identifying it as the foundational or basic principle.