| nonobjective | (adjective) not representing or imitating external reality or the objects of nature | Synonyms: abstract, abstractionist, nonfigurative |
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| nonobligatory | (adjective) not required by rule or law | Synonyms: nonmandatory |
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| nonobservance | (noun) a lack of conformity with law or custom or practice etc. | - |
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| nonobservant | (adjective) failing or refusing to observe religious customs | - |
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| nonoccurrence | (noun) absence by virtue of not occurring | - |
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| nonopening | (adjective) not open; not opening | - |
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| nonoperational | (adjective) (military) not involved in military operations | Synonyms: inactive |
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| nonoptimality | (noun) The state of not being best, most favourable or desirable. | - |
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| nonoscillatory | (adjective) not having periodic vibrations | - |
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