Reshape how you move as conditions change, without losing what the movement is for.
Adaptive Movement is the ability to reorganise how you move as constraints, opportunities and conditions change, while preserving the purpose of the action. Formal practice usually begins with repetition, but real conditions don't comply with the same rules. A posture or technique that works only in one ideal form may not be adaptable to daily life. This capability begins when you understand the organising purpose of a movement well enough to change its visible shape without losing its function. A movement isn't fully learned until it can change and still achieve its aim.
For a newcomer, it begins with gentle variation: walking as its own practice, moving through a form at different speeds, working in restricted space, and playing with simple constraints.
For practitioners, it becomes functional variability, finding more than one workable solution, and adjusting timing, angle, range or force instead of forcing the original technique. It is recovering balance or transitioning without freezing when the ideal position is lost. Neither is it adding random movement or novelty for its own sake; the purpose is always retained.
In daily life, the same capability appears as adaptability: keeping your footing and function when circumstances shift, and finding another way through rather than stalling when the first one doesn't fit.