PART 1 - PRELIMINARY PROVISIONS
4.
Interpretation—
(1)In this Act, unless the context otherwise requires,—
New Zealand prison or prison means a prison within the meaning of section 3(1) of the Corrections Act 2004
New Zealand prisoner or prisoner means a person who is for the time being in legal custody at any New Zealand prison, whether or not that person has been convicted of an offence
Enforcement of sentences imposed
Enforcement of sentence of imprisonment
EDIT.