It means that there must be at least 90 members present before a decision can be taken that is binding on the whole body.
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Different bodies have different numbers for their quorum.
Fifth Quorum of the Seventy was created in 1997.
Quorum.
A quorum is whatever the rules of the committee say, or the rules of the bigger organization that appointed the committee and to which the committee reports back.
According to my dictionary, a quorum is "Such a number of the officers or members of any body as is competent by law or constitution to transact business..." So I would assume that a quorum is not a fixed number, but is a number added to a constitution for legal, political, or business reasons.