1. Consisting of ten years, or happening every ten years.

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

• deenial,
• dennial,
• decennium,
• decenniem,
• Decenal,
• secennial,
• xecennial,
• decenial,
• decennal,
• decennia,
• decenniall,
• Decenniel,
• decenia,
• decennovall,
• decllinal,
• deecrial,
• decerial,
• deccrial,
• demonnial,
• descensinal

The adjective form of the word "decennial" is "decennial".

The plural of the "Decennial" can be the "decennials".

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