What is Indefinite?

Legal Definition
A number which may be increased or diminished at pleasure.

2. When a corporation is composed of an indefinite number of persons, any number of them consisting of a majority of those present may do any act unless it be otherwise regulated by the charter or by-laws. See Definite number.
-- Bouviers Law Dictionary
Legal Definition
That which is undefined; uncertain.
-- Bouviers Law Dictionary