This is the 442nd most frequent Russian word.
закон
Law.
Here, 'закон' (law) is used metaphorically to describe a principle of nature.
Закон природы неумолим.
The law of nature is relentless.
In this sentence, 'закон' (law) refers to a set of formal legal rules established by a government.
Он строго следует закону.
He strictly follows the law.
The word 'закон' (law) in this context represents a scientific principle or rule.