late 14c., "making or becoming pregnant," from Old French impregnacion or directly from Late Latin impregnationem (nominative impregnatio), noun of action from past participle stem of impraegnare "to impregnate" (see impregnate).
imprecise
imprecision
impregnability
impregnable
impregnate
impregnation
impresario
imprescriptible
impress
impressable
impressed