What is "staggered board of directors"

n. a board of directors a portion of whose members are elected each year instead of all members being elected annually

A staggered board of directors or classified board is a prominent practice in US corporate law governing the board of directors of a company, corporation, or other organization, in which only a fraction (often one third) of the members of the board of directors is elected each time instead of en masse (where all directors have one-year terms). Each group of directors falls within a specified "class"—e.g., Class I, Class II, etc.—hence the use of the term "classified" board.