transition zone

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transition zone (plural transition zones)

  1. Any of several physical zones in which the properties, or the behaviour of something undergoes a radical change
    1. (physics) The stage in the flow or a fluid during which it changes from laminar to turbulent
    2. (geology) The region between the upper and lower mantle characterized by a rapid increase in density
    3. The area between a central business district and residential housing in a city