Definition 3 here.
Student or Learner
This is a story of a disabled girl who got an artificial leg, moved by a handicapped dolphin's movement. What does "adjust the fit" mean? Especially "the fit", which seems to mean "harmony or something"?
mo3-46ex)...When they were done, Winter streaked off through the water. Kazazic was fascinated. ‘If she can do this, there’s no way I can’t,’ she thought. Within ten days, she had a new leg with its soft liner and built-in microprocessor that adjusts the fit for different activities. It was the disabled dolphin that gave inspiration and helped her to feel pain-free for the first time in almost 16 years.
What an interesting coincidence. Just yesterday I watched the movie based on that dolphin. The work done to make the tail fit and be comfortable for Winter has indeed helped human amputees with their artificial limbs.
I don't know much about the mechanics of artificial legs, but fit means how well something matches your shape. A new suit should fit you well. Does your winter coat from last year still fit? Now that I've lost some weight, I need new clothes; my old ones no longer fit well.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.