When was your last vacation that meets your definition? Do you think everyone "deserves" a vacation?
ETA: To me, a vacation is something more than just a day off work. I usually think they mean it is more than 1 day off (probably more like 2-5 days in a row) and most often are using it to travel or do an out of the norm activity (wedding, concert, kayak, etc..). I also think that usually a vacation day is paid by the employer v. just a day off which can be unpaid.