oligomer refers to polymers that have low molecular weight owing to the fact that they have few repeat units. it's a way to catagorize polymers by size rather than some structural property. oligomers are composed of between 2 and ten monomers, usually. dimers, trimers (you can guess what these are), for example, are all oligomers.

this nomenclature might seem familiar if you remember that one of the myriad governments that the greeks invented was the oligarchy -- rule by an elite class small in number.

i'm not sure if there's any significance to this catagorization -- if there's any physical luxury that they have owing to their small size...