| impregnability | (noun) having the strength to withstand attack | Synonyms: invulnerability |
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| impregnation | (noun) creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant | Synonyms: fecundation, fertilisation, fertilization |
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| (noun) the process of totally saturating something with a substance | Synonyms: saturation |
| (noun) material with which something is impregnated | - |
| pregnancy | (noun) the state of being pregnant; the period from conception to birth when a woman carries a developing fetus in her uterus | Synonyms: gestation, maternity |
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| pregnanediol | (noun) a compound found in women's urine during certain phases of the menstrual cycle and in the urine of pregnant women | - |
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