All 3 Uses

adapt
in
Atonement, by Ian McEwan
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He discovered he was already well adapted to an army regime, to the terrors of kit inspection and the folding of blankets into precise squares, with the labels lined up.†
Chpt 2 *

well adapted = well suited
It was the time of adapting to unthinking obedience, of learning to carry bedpans in a stack, and remembering a fundamental rule: never walk up a ward without bringing something back.†
Chpt 3 *

adapting = changing to fit a different situation
They strolled around the lake, bought tea at a stall, and rented deck chairs to listen to elderly men of the Salvation Army playing Elgar adapted for brass band.†
Chpt 3

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
(3) (meaning too rare to warrant focus)