perse of 3. adjective (1) ˈpərs. : of a dark grayish blue resembling indigo. per se. of 3. adverb. (ˌ)pər-ˈsā, also per-ˈsā, (ˌ)pər-ˈsē : by, of, or in itself or oneself or themselves : as such : intrinsically. per se. of 3.