All 5 Uses of

adapt
in
Don Quixote

Four days were spent in thinking what name to give him, because (as he said to himself) it was not right that a horse belonging to a knight so famous, and one with such merits of his own, should be without some distinctive name, and he strove to adapt it so as to indicate what he had been before belonging to a knight-errant, and what he then was; for it was only reasonable that, his master taking a new character, he should take a new name, and that it should be a distinguished and full-sounding one, befitting the new order and calling he was about to follow.†
Chpt 1.1-2 *

adapt = change to fit a different situation; or make suitable

or Rocinante, for that, ladies mine, is my horse's name, and Don Quixote of La Mancha is my own; for though I had no intention of declaring myself until my achievements in your service and honour had made me known, the necessity of adapting that old ballad of Lancelot to the present occasion has given you the knowledge of my name altogether prematurely.†
Chpt 1.1-2

adapting = changing to fit a different situation

By-and-by, after they had between them carefully thought over what they should do to carry out their object, the curate hit upon an idea very well adapted to humour Don Quixote, and effect their purpose;†
Chpt 1.25-26 *

well adapted = well suited

Nor are the poets who write them to be blamed for this; for some there are among them who are perfectly well aware of their faults, and know what they ought to do; but as plays have become a salable commodity, they say, and with truth, that the actors will not buy them unless they are after this fashion; and so the poet tries to adapt himself to the requirements of the actor who is to pay him for his work.†
Chpt 1.47-48

adapt = change to fit a different situation; or make suitable

Don Quixote held his peace and said no more, calmly awaiting the reply of the beauteous princess, who, with commanding dignity and in a style adapted to Don Quixote's own, replied to him in these words, "I give you thanks, sir knight, for the eagerness you, like a good knight to whom it is a natural obligation to succour the orphan and the needy, display to afford me aid in my sore trouble;†
Chpt 1.45-46

Definitions:

(1) (adapt as in: adapted to the new rules)
changed to fit a different situation; or made suitable
(2) (adapted as in: the species is well adapted for)
to be especially well suited or appropriate for something