This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state or characteristic of being in need; neediness.

n. A circumstance or event which is necessary or unavoidable, especially because it is a requirement of a social role or natural state of affairs.

n. Necessity.

n. Necessitousness; want.

n. Necessary connection or relation.

n. A sacred obligation of family or friendship; a tie or bond of relationship or intimacy.

"It had been of all things the most harassing and wearing -- a life of dreary necessitude -- a perpetual struggle with debt."

necessitousness    want