Immunity
An exemption that a person (individual or corporate) enjoys from the normal operation of the law such as a legal duty or liability, either criminal or civil. For example, diplomats enjoy "diplomatic immunity" which means that they cannot be prosecuted for crimes committed during their tenure as diplomat . Another example of an immunity is where a witness agrees to testify only if the testimony cannot be used at some later date during a hearing against the witness.

Indictable offence
An offence which, in Canada , is more serious than those which can proceed by summary conviction. This is the Canadian equivalent to the USA "felony". Murder and treason are examples of crimes committed in Canada which would be indictable offences. These crimes are usually tried by federally-appointed judges and carry heavy sentences.

Indictment
USA : a formal accusation returned by a Grand Jury, that charges a person with a serious crime. It is on the basis of an indictment that an accused person must stand trial.