What do you consider a "half bath"?

Half-bath generally refers to a bathroom with no tub/shower. It has a toilet and a sink. You can do half the stuff you can do in a normal bathroom (i.e. not bathe). A bathroom is still full if it has a shower but no tub because you can still bathe. Not sure if there is a general term for that type of bathroom or not, but my master bath is like this. Tubs are nasty.