• A lone Buddha
• A Buddha on their own
• A private Buddha

General Definition:

• Pratyekabuddas are Buddhists who have achieved enlightenment on their own, without the use or aid of teachers or guides.
  

In-Depth Information:

• Pratyekabuddhas are believed to arise only in ages where there is no Buddha and/or the Buddhist teachings
• Some schools of Buddhist teachings assert that Pratyekabuddhas are not omniscient while others believe they are the same as Bodhisattvas.