Semantically, Pluto is still a "planet" (as far as the definition of the word goes linguistically), but is specifically classified as a dwarf planet by the International Astronomical Union.
It strikes me as disingenuous, then, for anyone to authoritatively state that Pluto is "not a planet" without clarifying their use of the word "planet" - it leads to a lot of confusion amongst the public who suddenly believe something has physically changed, as we see here.
It strikes me as disingenuous, then, for anyone to authoritatively state that Pluto is "not a planet" without clarifying their use of the word "planet" - it leads to a lot of confusion amongst the public who suddenly believe something has physically changed, as we see here.