0 (government by) a small group of powerful people
1 a government in which power is held by a small group of people
2 the fact of a country being ruled or controlled by a small group of powerful people:
The real difference between oligarchy and democracy is wealth.
3 a country or industry that is controlled by a small group of powerful people, or these people considered as a group:
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
