Capable of being, or liable to be, indicted; subject to indictment; as, an indictable offender or offense.

liable to be accused, or cause for such liability; "the suspect was chargeable"; "an indictable offense"

A serious criminal offence capable of trial in the Crown Court.

an indictable trial is one where the accused has been charged with the more serious types of offences and is usually a trial by jury.