Reporting sexual abuse is not feminism. Given how difficult sexual abuse is to prove and the backlash that an accusation against a person can draw, it actually takes a heck of a lot of courage to do so for any normal person.
The problem though is that feminists tend to politicize sexual abuse. Take the #metoo campaign as an example. At first, women started posting #metoo to reveal just how widespread the problem was. Then some women started to say that men needed to participate too, so floods of men started posting #metoo too to reveal abuse that they'd suffered, often at the hands of women. That's when feminists stepped in to shut the men down. What the feminists hadn't anticipated was the women's backlash. Women came out in defense of men in droves and more women came out revealing abuse at the hands of women too.
The way the feminists reacted to the men's participation in the #metoo campaign probably harmed feminism more than anything else in recent history. Probably more women turned their backs on feminism precisely during that campaign in reaction to the feminists trying to politicize it
There is no 'official' definition. Most feminists define it as advocacy for gender equality, some as advocacy for women's rights, and then they have all kinds of ideas as to what that means. The feminist movement is actually quite fractured with all kinds of contradictory beliefs.
