As used in this chapter, the following words have the following meanings:

(1) "Institution" means an adult correctional facility identified in RCW 72.01.050(2) or any similar facility hereafter established, or a work/training release facility established pursuant to chapter 72.65 RCW;

(2) "Superintendent" means the superintendent of an adult correctional facility identified in RCW 72.01.050(2) or any similar facility hereafter established or the supervisor of a work/training release facility established pursuant to chapter 72.65 RCW;

(3) "Inmate" means a person under the custody of the state department of corrections but does not include a parolee or a probationer.