| imperfect | (noun) a tense of verbs used in describing action that is on-going | Synonyms: continuous tense, imperfect tense, progressive, progressive tense |
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| imperfectibility | (noun) the capability of becoming imperfect | - |
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| imperfection | (noun) the state or an instance of being imperfect | Synonyms: imperfectness |
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| imperfective | (noun) aspect without regard to the beginning or completion of the action of the verb | Synonyms: imperfective aspect |
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| imperfectness | (noun) the state or an instance of being imperfect | Synonyms: imperfection |
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| nonperformance | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, neglect, negligence |
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| perfect | (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect tense, perfective, perfective tense |
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| perfecta | (noun) a bet that you can pick the first and second finishers in the right order | Synonyms: exacta |
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| perfecter | (noun) a skilled worker who perfects something | - |
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| perfectibility | (noun) the capability of becoming perfect | - |
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| perfection | (noun) the act of making something perfect | - |
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| (noun) an ideal instance; a perfect embodiment of a concept | Synonyms: beau ideal, idol, paragon |
| (noun) the state of being without a flaw or defect | Synonyms: flawlessness, ne plus ultra |
| perfectionism | (noun) a disposition to feel that anything less than perfect is unacceptable | - |
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| perfectionist | (noun) a person who is displeased by anything that does not meet very high standards | - |
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| perfective | (noun) the aspect of a verb that expresses a completed action | Synonyms: perfective aspect |
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| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect, perfect tense, perfective tense |
| perfidiousness | (noun) betrayal of a trust | Synonyms: perfidy, treachery |
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| perfidy | (noun) an act of deliberate betrayal | Synonyms: betrayal, treachery, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, treachery |
| perfluorocarbon | (noun) a powerful greenhouse gas emitted during the production of aluminum | Synonyms: PFC |
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| perforation | (noun) the act of punching a hole (especially a row of holes as for ease of separation) | - |
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| (noun) a line of small holes for tearing at a particular place | - |
| (noun) a hole made in something | - |
| performance | (noun) the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it | Synonyms: carrying into action, carrying out, execution |
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| (noun) the act of presenting a play or a piece of music or other entertainment | - |
| (noun) any recognized accomplishment | - |
| (noun) a dramatic or musical entertainment | Synonyms: public presentation |
| (noun) process or manner of functioning or operating | Synonyms: functioning, operation |
| performer | (noun) an entertainer who performs a dramatic or musical work for an audience | Synonyms: performing artist |
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| performing | (noun) the performance of a part or role in a drama | Synonyms: acting, playacting, playing |
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| perfume | (noun) a toiletry that emits and diffuses a fragrant odor | Synonyms: essence |
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| (noun) a distinctive odor that is pleasant | Synonyms: aroma, fragrance, scent |
| perfumer | (noun) a person who makes (and sells) perfumes | - |
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| perfumery | (noun) the art of making perfumes | - |
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| (noun) an establishment where perfumes are made | - |
| (noun) store where perfumes are sold | - |
| (noun) perfumes in general | - |
| perfusion | (noun) pumping a liquid into an organ or tissue (especially by way of blood vessels) | - |
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| pluperfect | (noun) a perfective tense used to express action completed in the past | Synonyms: past perfect, past perfect tense, pluperfect tense |
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| superfamily | (noun) (biology) a taxonomic group ranking below an order but above a family | - |
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| superfecta | (noun) a bet that you can pick the first four finishers in a race in the right order | - |
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| superfecundation | (noun) fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of coitus (especially by different males) | - |
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| superfetation | (noun) fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time | - |
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| superficiality | (noun) lack of depth of knowledge or thought or feeling | Synonyms: shallowness |
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| (noun) shallowness in terms of affecting only surface layers of something | - |
| superficies | (noun) outer surface of an area or a body | - |
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| (noun) the purely external aspect of a thing; superficial appearance | - |
| superfluity | (noun) extreme excess | Synonyms: embarrassment, overplus, plethora |
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| superfood | (noun) a food with health benefits | - |
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| underperformer | (noun) a business that is less successful than expected | - |
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| (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underachiever |