Text: 1) Outside; as extreme parts, the highest and lowest parts in part-music. 2) Expanded to its furthest limit; as, extreme intervals, intervals greater than major or normal; e.g., C to G# an extreme fifth. Such intervals are called also augmented, superfluous, or sharp. 3) Not closely related; a modulation into an extreme key is one into any key, other than, its own relative minor, its dominant, and sub-dominant, and their relative minors. 4) An old term for any key having morethan three sharps or flats.

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Source: 125