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to be able (to do); to be capable (of doing)
「適う」 has another reading with different meanings.
力の及ぶ限り、適う限り努力する。
I will try as hard as I can, to the extent I am able.
その試練を乗り越えるに適った者だけが選ばれた。
Only those capable of overcoming the trial were selected.
彼女はこの難局を打開するに適っている。
She is capable of breaking through this impasse.