Pejoratively...
Following the death of Eunice Kennedy Shriver, founder of the Special Olympics, Slate this week discussed the use of mentally retarded. This term has apparently been deemed unacceptable, and is being replaced by intellectual disability.
The process by which a term designating a sensitive concept becomes considered increasingly taboo, and is eventually superseded by a more politically correct expression, is known among linguists as ‘pejoration’. Thus coloured and negro, once standard, gave way to black. Moreover, many speakers nowadays have becomes uneasy with black; So much so, that when my 9th grade English class studied a book about apartheid, students consistently referred to South African characters as ‘African-American’. Often, pejoration occurs not because the original terms were intrinsically offensive (though sometime they are), but rather because they have been tainted by use in offensive contexts.
What particularly caught my eye in the Slate article was that several organisations had changed their names to reflect the switch to intellectual disability. Clearly it is a problem if a group’s name becomes offensive. On the other hand, changing that name might lead to confusion about whether it is the same organisation. In fact, the National Association for the Advancement of Colored People has opted to retain its title, even though colored has long been of dubious acceptability. Ultimately, I think it comes down to group membership: Sometimes it’s okay to use a term for yourself that you wouldn’t find acceptable coming from an outsider.