The condition of being uninformed or uneducated; lack of knowledge or information. / (religion, in the plural) Sins committed through ignorance.

A totally ignorant person—unknowledgeable, uneducated, or uninformed; a fool.

(law, dated) A grand jury's ruling on an indictment when the evidence is determined to be insufficient to send the case to trial.

(law, transitive) To make such a ruling against (an indictment).

(transitive) to set fire to (something), to light (something) / (transitive) to spark off (something), to trigger / (intransitive) to commence burning.

Unknowledgeable or uneducated; characterized by ignorance. / Not knowing (a fact or facts), unaware (of something). / (slang) Ill-mannered, crude. / (obsolete) unknown; undiscovered

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