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 fire 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. "Firefighter". 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 a firefighter and was not a fire officer.
2. "Association". The uniformed fire officers' association of the fire department, city of New York.
3. "Fiscal year". Any year commencing with the first day of July and ending with the thirtieth day of June next following.
4. "Board". The board of trustees provided for in section 13-394 of this chapter.
5. "Fire officer".
(a) Any member of the uniformed force of the fire department holding the position of lieutenant or any position of higher rank in such force and (b) any pilot, marine engineer (uniformed) or assistant marine engineer (uniformed) who is a member of pension fund subchapter two or pension fund subchapter one and (c) any member of either such pension fund holding a position in the fire marshal occupational group above the rank of fire marshal (uniformed).
6. "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 fire officer.
7. "Variable supplement". Any sum authorized to be paid to a pension fund beneficiary pursuant to the provisions of this subchapter.
8. "Pension fund subchapter two". The New York fire department pension fund subchapter two maintained pursuant to subchapter two of chapter three of this title.
9. "Pension fund subchapter one". The New York fire department pension fund maintained pursuant to subchapter one of chapter three of this title.