Mass. Gen. Laws ch. 164 § 69B
The following words and phrases as used in sections sixty-nine C to sixty-nine F, inclusive, shall, unless the context otherwise requires, have the following meanings:
"Municipal light board", the municipal light board, municipal gas and electric commission or similar body in a city or town having a municipal light board, gas and electric commission or similar body; the mayor of a city having no municipal light board, municipal gas and electric commission or similar body; or the selectmen of a town having no municipal light board, municipal gas and electric commission or similar body.
"Manager", the manager of municipal lighting of the city or town.
"Cadet engineer", any individual who has contracted with a city or town pursuant to the provisions of section sixty-nine C, and who has not completed "graduate on the job training" as provided for in said section.
"Plant", the municipal light plant or the municipal gas plant or the municipal gas and electric plant of the contracting city or town.
"Educator", the superintendent of schools of the contracting city or town, or the superintendent or director of any accredited school or school system located within such city or town, a member of the school board or school committee of the contracting city or town, or a principal officer of any duly accredited high school or junior high school located within the contracting city or town.
Mass. Gen. Laws ch. 164, § 69B