| Term | Definition |
| nebulous | Vague; unspecific or undefined |
| necromancy | The practice of communicating with the deceased in order to forsee the future |
| nefarious | Extremely wicked or vicious |
| neonate | A newborn child |
| nihilism | The belief that traditional values and beliefs are illogical and the existence is useless; that belief that conditions in the social organization are intended to make destruction good or desirable |
| nomenclature | A system of scientific names |
| non sequitur | A statement that does not follow through logically from anything else said |
| novel | New and not resembling anything formerly known; original |