La ignorancia (del verbo "ignorar", del latín ignorare -"no saber"-, derivado negativo de la raíz gnō- de (g)noscere -"saber"- Se puede entender en dos sentidos: \n* En un sentido absoluto:Ignorancia o ignorante, aplicado sin matices en sentido absoluto a una persona o grupo social; equivale a un insulto que manifiesta una degradación en la escala social y en la valoración individual. \n* Respecto a un contenido concreto. Cuando se aplica a un contenido concreto significa «no saber algo determinado», frente al conocimiento de otras muchas cosas o «tener un conocimiento imperfecto sobre…» En este segundo sentido es donde el concepto de ignorancia adquiere toda su dimensión en su referencia al conocimiento, transformándose en una herramienta para conseguirlo. No se trata, entonces de una «ausencia» sino de una «carencia de» o de una «imperfección» respecto de un conocimiento adecuado. En este caso la ignorancia nos muestra diferentes propiedades del proceso cognitivo así como acerca de la afirmación de su validez como conocimiento.

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Ignorance is a state of being uninformed or lack of knowledge. The word ignorant is an adjective describing a person in the state of being unaware and is often (incorrectly) used to describe individuals who deliberately ignore or disregard important information or facts. Individuals that are disregarding their duty to their country, community and family are more than simply guilty of ignorance but are also guilty of negligence. This should not be confused with lack of knowledge. Ignoramus is commonly used in the UK, Ireland, and the US as a term for someone who is willfully ignorant. Ignorance is distinguished from stupidity, although both can lead to "unwise" acts. Writer Thomas Pynchon articulated about the scope and structure of one's ignorance: "Ignorance is not just a blank space on a person's mental map. It has contours and coherence, and for all I know rules of operation as well. So as a corollary to [the advice of] writing about what we know, maybe we should add getting familiar with our ignorance, and the possibilities therein for writing a good story." The legal principle that ignorantia juris non excusat, literally "ignorance of the law is no excuse", stands for the proposition that the law applies also to those who are unaware of it.

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