One who is ignorant.

The act of igniting. / The initiation of combustion. / (automotive, mechanical engineering) A system for activating combustion in a combustion engine.

(geology) one of the major groups of rock that makes up the crust of the Earth; formed by the cooling of molten rock, either below the surface (intrusive) or on the surface (extrusive)

(baseball) Catcher's equipment

Archaic form of igloo.

(folklore) A will o' the wisp. / (figuratively) A delusion, a false hope.

A lack of knowledge results in happiness; it is more comfortable to not know certain things.

(idiomatic, law) A decision in bad faith to avoid becoming informed about something so as to avoid having to make undesirable decisions that such information might prompt.

A personification of ignorance.

plural of ignition temperature