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Definition of Transition point
1. Noun. (fluid dynamics) The point in space at which fluid flow around an object changes from laminar to turbulent. ¹
2. Noun. The temperature at which a substance changes from one state of matter to another, or from one solid phase to another. ¹
3. Noun. Any similar point at which a characteristic of a system changes abruptly. ¹
¹ Source: wiktionary.com