1. The ordinal of twelve.

2. One of twelve equal parts.

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

• twelveth,
• tewlfth,
• twevleth,
• twelfh,
• twevlth,
• twelvth,
• twelth,
• twelft,
• twelfe,
• tweplth,
• twelevth,
• tweleth,
• tweveth,
• twelvthe,
• twelf,
• rwelfth,
• fwelfth,
• helfth,
• twelfs,
• tielth

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

The plural form of the word "twelfth" is "twelfths"

The singular form of the word "twelfth" is "twelfth".