adj

• In favor of the abolition of any particular institution or practice.
  "This case, and others, drove and enlarged the existing abolitionist movement in the country, opposed, of course, by the merchants and plantation owners who were making a massive profit from the slaves held in various colonies."

noun

• A person favoring or advocating for the abolition of any particular institution or practice.
  "Among other slave notabilities of the plantation, was one called by everybody Uncle Isaac Copper. It is seldom that a slave gets a surname from anybody in Maryland; and so completely has the south shaped the manners of the north, in this respect, that even abolitionists make very little of the surname of a negro."