What does "corpus delecti" mean?

Corpus delicti (plural: corpora delicti) (Latin: "body of crime") is a term from Western jurisprudence referring to the principle that a crime must have been proven to have occurred before a person can be convicted of committing that crime. For example, a person cannot be tried for larceny unless it can be proven that property has been stolen. Likewise, in order for a person to be tried for arson it must be proven that a criminal act resulted in the burning of a property. Black's Law Dictionary (6th ed.) defines "corpus delicti" as: "the fact of a crime having been actually committed".