In chemistry, an<unk>  consists of a finite number of monomer units (ολιγος, or oligos, is Greek for "a few"), in contrast to a polymer which, at least in principle, consists of an unbounded number of monomers.
In biochemistry, the term<unk>  is used for short, single stranded DNA fragments, generally used in hybridization experiments (bound to glass slides or nylon membranes). It can also refer to a protein complex made of two or more subunits. In this case, a complex made of several different protein subunits is called a hetero-oligomer. When only one type of protein subunit is used in the complex, it is called homo-oligomer.
In<unk> ization a chemical process only converts monomers to a finite degree of polymerization. The actual figure is a matter of debate, often a value between 10 and 100.
Oligomer
Foldamers
Isomer
Isotopomers
Electron shell
Macrocycle
Complex 
Nuclear isomer