Unless the articles of organization or by-laws otherwise provide, a majority in interest of all stock issued, outstanding and entitled to vote at a meeting shall constitute a quorum.
Mass. Gen. Laws ch. 156B, § 39
Quorum
Known as the Business Corporation Law
The act spans §§ 156–156 (126 sections).
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.