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This is not really a question for this forum. In fact it's not really a question for any forum because there are good articles on terminal velocity on both Wikipedia and Simple English Wikipedia.
Some answers already given may have been plagiarised from Wikipedia. i.e. quoted without giving the reference.
The highest velocity attainable by an object as it falls through air.
This is not really a question for this forum
terminal velocity is achievable velocity of an object when falling through fluid and its measures as terminal velocity.
terminal velocity is the highest achievable velocity of an object when falling through fluid
If sphere (any solid substance) is suspended in fluid, initially sphere is falling with weight and after sometime upward force is balanced by weight. Hence solid starts falling with constant velocity known as terminal. This velocity is determined by Stokes formula in Physics