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nonparametric
nonpareil
nonpartisan
nonpenetrative
nonperforming asset
nonperson
nonplaying
nonplus
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nonprice competition
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nonreturn
non·re·turn [ nòn ri túrn ]


adjective 
Definition:
 
permitting flow in only one direction: permitting a flow of air or liquid through a pipe or similar conduit in one direction only
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