English practice. A writ enclosing a record sent to be tried in a county palatine; it derives its name from the Latin word mittimus, "we send." It is the jury process of these counties, and commands the proper officer of the county palatine to command the sheriff to summon the jury for the trial of the cause, and to return the record, etc.crim. law, practice. A precept in writing, under the hand and seal of a justice of the peace, or other competent officer, directed to the jailer or keeper of a prison, commanding him to receive and safely keep, a person charged with an offence therein named until he shall be delivered by due course of law.