This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The capability of a person or argument to convince or persuade someone to accept a desired way of thinking.

n. The quality of being persuasive or convincing; the quality of winning over the mind or will of another.

n. the power to induce the taking of a course of action or the embracing of a point of view by means of argument or entreaty

"He did not hamper his exposition, like Hering, by a subsidiary hypothesis of vibrations which may or may not be true, which burdens the theory without giving it greater carrying power or persuasiveness, which is based on no objective facts, and which, as"

power    powerfulness   

persuasively    persuasive    persuade   

convincingness   

cogency    convincingness   

astuteness    fervency    graciousness    lucidity    resourcefulness