Homoleptic Complexes are compounds in which all the ligands bound to the metal center are identical. Some examples are given below:
There are some who believe that the word is not really necessary -- for example, the term "binary metal carbonyl" has long been used to describe a homoleptic carbonyl compound. However, "homoleptic" has gained widespread use in organometallic chemistry.
Additional information about coordination number and some definitions in coordination chemistry is available.