No. 14,590 in Russian
первопричиной
"Первопричиной" means "the primary cause" or "the root cause."
In a sentence
Организация определила отсутствия ресурсов как первопричиной задержки проекта.
The organization identified the lack of resources as the root cause of the project's delay.
The word 'первопричиной' is used here in an instrumental case form as part of a predicate to indicate that the lack of resources is assigned as the primary or root cause of the delay.
Наука стремится понять первопричину природных явлений.
Science strives to understand the root cause of natural phenomena.
In this sentence, 'первопричину' is in the accusative case as it serves as the direct object of the verb 'понять' (to understand), indicating what is being understood.
Докладчик объяснил, что экономические проблемы являются первопричиной социальных потрясений.
The speaker explained that economic issues are the root cause of social upheavals.
Here, 'первопричиной' is used as a predicate nominative in the instrumental case following the verb 'являются' to attribute the primary cause to economic issues.
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