Felony

n. serious crime or offense usually punishable by more than one year in prison (i.e. robbery or murder)

The term felony is used in common law systems for very serious crimes, whereas misdemeanors are considered to be less serious offenses. This distinction is principally used in criminal law in the United States legal system, where the federal government generally considers a crime punishable by more than five days up to a year in prison to be a misdemeanor, while considering crimes punishable by greater than a year in prison to be felonies; crimes of five days or less in prison, or no prison at all, are considered infractions.
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Felony, n a crime declared by statute to be more serious than a misdemeanor and deserving of a more severe penalty. [more]Felony - Community and Resources

Noun
1. a serious crime (such as murder or arson)
(hypernym) crime, law-breaking
(hyponym) capture, seizure

A serious crime for which the punishment is prison for more than a year or death. - (read more on Felony)