1. The act of invalidating.

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

• invaitation,
• invaluation,
• invalidations,
• invalidatin,
• unvalidation,
• jnvalidation,
• knvalidation,
• onvalidation,
• 9nvalidation,
• 8nvalidation,
• invaliation,
• invalidtion,
• invalidaion,
• invalidaton,
• invaldiation,
• invaladation,
• insaliuvation,
• Invateration,
• invagintaion,
• invaladations

• invalidate,
• inflation,
• inapplicable,
• invalidated,
• infliction,
• invalidator,
• invalidness,
• invalidating,
• inapplicability,
• invalidism,
• invitation,
• invalidity.

The adjective form of the word "invalidation" is "invalidating".

The plural of the "invalidation" can be the "invalidations".

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