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rational number

The rest, however, the curvature that by some ethereal, spiritual means escaped the calculable embrace that could turn it into a rational number—that, said the prosecutor, his jaw trembling, that was pi!

Thomas Mann -- The Magic Mountain

a number that can be expressed as a simple fraction; i.e., one integer over another such as 1/2

The rest, however, the curvature that by some ethereal, spiritual means escaped the calculable embrace that could turn it into a rational number—that, said the prosecutor, his jaw trembling, that was pi!