| primacy | (noun) the state of being first in importance | - |
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| primality | (noun) the property of being a prime number | - |
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| primaquine | (noun) synthetic antimalarial drug | - |
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| primary | (noun) a preliminary election where delegates or nominees are chosen | Synonyms: primary election |
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| (noun) one of the main flight feathers projecting along the outer edge of a bird's wing | Synonyms: primary feather, primary quill |
| (noun) coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit | Synonyms: primary coil, primary winding |
| (noun) (astronomy) a celestial body (especially a star) relative to other objects in orbit around it | - |
| primate | (noun) any placental mammal of the order Primates; has good eyesight and flexible hands and feet | - |
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| (noun) a senior clergyman and dignitary | Synonyms: archpriest, hierarch, high priest, prelate |
| primateship | (noun) the office of primate | - |
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| primatology | (noun) the branch of zoology that studies primates | - |
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| prime | (noun) a natural number that has exactly two distinct natural number divisors: 1 and itself | Synonyms: prime quantity |
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| (noun) the time of maturity when power and vigor are greatest | Synonyms: prime of life |
| (noun) the second canonical hour; about 6 a.m. | - |
| (noun) the period of greatest prosperity or productivity | Synonyms: bloom, blossom, efflorescence, flower, flush, heyday, peak |
| primer | (noun) any igniter that is used to initiate the burning of a propellant | Synonyms: fuse, fusee, fuze, fuzee, priming |
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| (noun) the first or preliminary coat of paint or size applied to a surface | Synonyms: flat coat, ground, primer coat, priming, priming coat, undercoat |
| (noun) an introductory textbook | - |
| primidone | (noun) an anticonvulsant (trade name Mysoline) used to treat grand mal seizures and essential tremor | Synonyms: Mysoline |
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| primigravida | (noun) (obstetrics) a woman who is pregnant for the first time | Synonyms: gravida I |
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| priming | (noun) the act of making something ready | - |
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| (noun) any igniter that is used to initiate the burning of a propellant | Synonyms: fuse, fusee, fuze, fuzee, primer |
| (noun) the first or preliminary coat of paint or size applied to a surface | Synonyms: flat coat, ground, primer, primer coat, priming coat, undercoat |
| primipara | (noun) (obstetrics) woman who has been delivered of a child for the first time | Synonyms: para I |
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| primitive | (noun) a word serving as the basis for inflected or derived forms | - |
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| (noun) a mathematical expression from which another expression is derived | - |
| (noun) a person who belongs to an early stage of civilization | Synonyms: primitive person |
| primitiveness | (noun) a wild or unrefined state | Synonyms: crudeness, crudity, primitivism, rudeness |
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| primitivism | (noun) a genre characteristic of (or imitative of) primitive artists or children | - |
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| (noun) a wild or unrefined state | Synonyms: crudeness, crudity, primitiveness, rudeness |
| primness | (noun) exaggerated and arrogant properness | Synonyms: priggishness |
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| (noun) excessive or affected modesty | Synonyms: Grundyism, prudery, prudishness |
| primo | (noun) the principal part of a duet (especially a piano duet) | - |
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| primogenitor | (noun) an ancestor in the direct line | Synonyms: progenitor |
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| primogeniture | (noun) right of inheritance belongs exclusively to the eldest son | - |
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| primordiality | (noun) The quality of being first, earliest or original. | - |
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| primordium | (noun) an organ in its earliest stage of development; the foundation for subsequent development | Synonyms: anlage |
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| primping | (noun) careful or finicky grooming | - |
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| primrose | (noun) any of numerous short-stemmed plants of the genus Primula having tufted basal leaves and showy flowers clustered in umbels or heads | Synonyms: primula |
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| primula | (noun) any of numerous short-stemmed plants of the genus Primula having tufted basal leaves and showy flowers clustered in umbels or heads | Synonyms: primrose |
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| primus | (noun) the presiding bishop of the Episcopal Church of Scotland | - |
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