A feminist today is the evolution of the feminist yesterday. It is going to be difficult to define that word at any point because by the time that definition goes to print, it has aged and absorbed more wisdom (or failed to from time to time).
A feminist wants equality for all, but he or she use the word "feminist" because the brand of self-courage being carried inside was inspired by feminists of long ago.
Just as a father bequeaths his last name to his son, just as a stormy night bequeaths humidity to the morning after, the struggles of the past to have a woman's citizenship fully respected bequeath the courage to keep pointing a finger in the face of those who would keep oppressing women if they could, or simply oppress the next minority in line.