Definition of crimen falsi in US English:

crimen falsi

noun

Law
  • Originally: a crime involving dishonesty or false statement, especially forgery. Later more usually: the body of crimes of this sort, including fraud, forgery, perjury, etc., considered collectively.

Origin

Early 17th century; earliest use found in William Segar (d. 1633), herald. From classical Latin crīmen falsī crime (or charge) of forgery from crīmen + falsī, genitive of falsum fraudulent tampering with documents, forgery, fraud, use as noun of neuter of falsus.