This is the 4878th most frequent Russian word.
источнике
"Источнике" means "source" or "origin" in English.
Here, 'источнике' (source) is used to refer to a trusted place or medium where information can be obtained.
Мы нашли информацию в надёжном источнике.
We found the information in a reliable source.
In this sentence, 'источнике' (spring) is used to describe a natural water source from which the river derives its water.
Река питается водой из горного источника.
The river is fed by water from a mountain spring.
Here, 'источнике' (source) refers to the origin of light, showing another type of application for the term.