As used in this subchapter, the following words and phrases shall have the following meanings, unless a different meaning is plainly required by the context:
1. "Variable supplements fund". The police superior officers' variable supplements fund established by this subchapter.
1-a. "Minimum period". The minimum period of credited service which a member of pension fund, subchapter one or pension fund, subchapter two is required by law to perform in order to be eligible to retire for service with immediate payability of retirement allowance.
1-b. "Police officer". A member of either pension fund referred to in subdivision one-a of this section who, at the time of retirement for service by reason of fulfillment of the minimum period, was not a police superior officer.
2. "Fiscal year". Any year commencing with the first day of July and ending with the thirtieth day of June next following.
3. "Board". The board of trustees provided for in section 13-280 of this subchapter.
4. "Police superior officer". Any member of the uniformed force of the police department who (a) hold the position of sergeant or any position of higher rank in such force, or (b) is a detective.
5. "Pension fund beneficiary". Any person who receives a retirement allowance by reason of having retired, on or after October first, nineteen hundred sixty-eight, for service (with credit for twenty or more years of service creditable toward the minimum period) as a member of pension fund, subchapter one or pension fund, subchapter two and as a police superior officer.
6. "Variable supplement". Any sum authorized to be paid to a pension fund beneficiary pursuant to the provisions of this subchapter.
7. "Pension fund, subchapter two". The New York police department pension fund maintained pursuant to subchapter two of chapter two of this title.
8. "Pension fund, subchapter one". The New York police department pension fund maintained pursuant to subchapter two of this title.