D.C. Mun. Regs. tit. 8-B, § 199
199.1 When used in this title, the following terms and phrases shall have the meanings ascribed:
Majority of the full Board - more than one-half (1/2) of the members of the Board of Trustees who are legally entitled to vote. The number of members of the Board who are legally entitled to vote is reduced when there are vacant seats on the Board. The majority of the full Board is eight (8) when all seats on the Board are filled or when there is one (1) vacancy. When there are two (2) or three (3) vacancies, the majority of the full Board is seven (7); when there are four (4) or five (5) vacancies, the majority of the full Board is six (6); and when there are six (6) or seven (7) vacancies, the majority of the full Board is five (5). Members who respond 'present' or abstain are counted for purposes of determining a majority.
Majority vote - more than one-half (1/2) of the members of the Board of Trustees who are present and voting. For purposes of determining a majority, members who are absent are not counted. Members who respond 'present' or abstain are not counted for purposes of determining a majority.
Quorum of the Board of Trustees - In accordance with the provisions of D.C. Code, § 31-1531, a quorum for the transaction of business at a meeting of the Board of Trustees is a majority of the fixed membership or eight (8) voting members of the Board of Trustees. The quorum requirement is not reduced by vacancies.
Two-thirds vote - at least two-thirds (2/3) of the votes cast by persons who are present and voting. For purposes of determining a two-thirds majority, members who are absent are not counted. Members who respond 'present' or abstain are not counted for purposes of determining a two-thirds majority.
SOURCE: Final Rulemaking published at 39 DCR 2296 (April 3, 1992).