Singer stated from a preference-utilitarian perspective, writing that speciesism violates the principle of equal consideration of interests, the idea based on Jeremy Bentham's principle: "each to count for one, and none for more than one." Singer stated that, although there may be differences between humans and nonhumans, they share the capacity to suffer, and we must give equal consideration to that suffering. Any position that allows similar cases to be treated in a dissimilar fashion fails to qualify as an acceptable moral theory. The term caught on; Singer wrote that it was an awkward word but that he could not think of a better one. It became an entry in the "Oxford English Dictionary" in 1985, defined as "discrimination against or exploitation of animal species by human beings, based on an assumption of mankind's superiority." In 1994 the "Oxford Dictionary of Philosophy" offered a wider definition: "By analogy with racism and sexism, the improper stance of refusing respect to the lives, dignity, or needs of animals of other than the human species."