Definition of "suasion"

The high intricate ways of the Keep had a strange power of suasion, an ability to carry conviction.

1977, Stephen R. Donaldson, The Illearth War, page 75

James Cable, the author of Gunboat Diplomacy (Chatto & Windus, 1971), has created an excellent case study of naval presence and suasion during the era of appeasement.

1982, Jacob Kipp, “Review of The Royal Navy and the Siege of Bilbao by James Cable”, in Military Affairs, volume 46, number 4, page 217