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1. Having the power to produce a desired effect or result; effective
2. Capable of having the intended consequence; effective as a means, measure, remedy, etc.
1. Tony Stark's new arc reactor was efficacious in keeping him alive, as well as powering his Iron Man suit.
2. Dr. Strange found an efficacious spell in the Book of Vishanti to protect the Earth from Dormammu.
3. Doraemon's gadgets are highly efficacious, helping Nobita out of difficult situations on many occasions.
4. The efficacious leadership of Professor Xavier often steered the X-Men towards achieving peace between humans and mutants.