1. The number produced by involving a million to the fourth power.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• quatrillions,
• 1uadrillion,
• 2uadrillion,
• wuadrillion,
• auadrillion,
• qyadrillion,
• qhadrillion,
• qjadrillion,
• qiadrillion,
• q8adrillion,
• q7adrillion,
• quzdrillion,
• qudrillion,
• quadrilion,
• qaudrillion,
• quardillion,
• quadrillonth,
• quadrillian,
• Quaterillion,
• qaudrillon

• quadrilateral,
• quadrillionth,
• quadrille.

The adjective form of the word "quadrillion" is "quadrillionth".

The plural of the "quadrillion" can be the "quadrillions".

The singular of the "quadrillion" can be the "quadrillion".