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non·ne·ces·si·ty | \ ˌnän-ni-ˈse-sə-tē 
, -ˈse-stē \
, -ˈse-stē \ plural nonnecessities
Definition of nonnecessity
1 : the condition of not being necessary … the issues being raised go well beyond legalities underlying the necessity or nonnecessity for an environmental impact statement. — Chemical and Engineering News
2 : something that is not a necessity : something inessential or unnecessary
… I had no intimation that … the government would permit shipment of such nonnecessities.— Neil G. Carey
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Time Traveler for nonnecessity
The first known use of nonnecessity was in 1593
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