| pertainym | (noun) meaning relating to or pertaining to | - |
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| pertinacity | (noun) persistent determination | Synonyms: doggedness, perseverance, persistence, persistency, tenaciousness, tenacity |
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| pertinence | (noun) relevance by virtue of being applicable to the matter at hand | Synonyms: applicability, pertinency |
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| pertinency | (noun) relevance by virtue of being applicable to the matter at hand | Synonyms: applicability, pertinence |
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| pertness | (noun) inappropriate playfulness | Synonyms: archness, impertinence, perkiness, sauciness |
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| (noun) quality of being lively and confident | - |
| perturbation | (noun) the act of causing disorder | Synonyms: disruption |
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| (noun) a disposition that is confused or nervous and upset | Synonyms: fluster |
| (noun) activity that is a malfunction, intrusion, or interruption | Synonyms: disturbance |
| (noun) (physics) a secondary influence on a system that causes it to deviate slightly | - |
| (noun) an unhappy and worried mental state | Synonyms: disturbance, upset |
| pertussis | (noun) a disease of the respiratory mucous membrane | Synonyms: whooping cough |
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