Are oligosaccharides and polysaccharides the same?

In Greek, oligo means a few, typically defined as "between 2 and 10," and poly means many, typically defined as "more than 10." So, typically, a polisaccharide is more complex than an oligosaccharide. However, if someone defines a few and many differently, according to that person's definition certain oligosaccharides could be the same as another person's polysaccharides, and vice versa.