This is the 391st most frequent Russian word.
необходимости
Necessities or needs.
This usage of 'необходимости' refers to the context of a required situation or condition where an action is justified.
В случае необходимости мы можем приехать.
In case of necessity, we can arrive.
Here, 'необходимости' is used to indicate an imperative reason or compulsion to perform an action.
Он делает это только по необходимости.
He does it only out of necessity.
In this sentence, 'необходимости' expresses the lack of need or obligation to perform an action.