necessitude
The state or characteristic of being in need; neediness.
rare
It had been of all things the most harassing and wearying—a life of dreary necessitude—a perpetual struggle with debt.
A circumstance or event which is necessary or unavoidable, especially because it is a requirement of a social role or natural state of affairs.
rare
The Americans. . . fear not the necessitudes of fortune.
Necessity.
rare
In Popperian terms, it demonstrates the necessitude of public debate.
A relation or connection between people or things.
archaic
The relation and necessitude is trifling and loose, and they are all equally contemptible; because the mind entertains no loves or union.
Where it comes from
From Latin necessitūdō, from necesse + -tūdō, from ne- + cessus.
Adapted from the Wiktionary entry necessitude (CC BY-SA 4.0).