Persuasion in Persuasion

The Oxford English Dictionary defines persuasion as, " the action or an act of persuading or attempting to persuade; the addressing of arguments or appeals to a person in order to induce cooperation, submission, or agreement; the presenting of persuasive reasoning or compelling arguments." It is interesting to observe Austen's definition of the word within the text. Austen's first use of the word occurs when discussing Anne's prior engagement to Wentworth, saying she was "persuaded" to believe that despite his ill-prospects, he would find success in the navy. It is interesting because many of Austen's uses of the word exemplify the "submission" part of the definition of persuasion. It is as if Anne were subdued to regard her engagement in that manner, rather than an organic emotional upheaval. Austen uses the word again when Anne has to "persuade" herself to believe that the man who is renting her father's estate is the brother-in-law of her former love. This is a really weird use of the word because it seems out of  place. Why would Anne have to persuade herself of the truth? Perhaps this demonstrates a connection between the word persuasion, above all the title of the book, and Wentworth.