1. That may be defined.

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

• depenable,
• definally,
• definatlye,
• definaly,
• definanly,
• definatle,
• definatly,
• defensable,
• definate,
• definaely,
• definatley,
• deferable,
• defineable,
• deffinable,
• definnable,
• definible,
• deftigable,
• Definatude,
• deelineable,
• desinable

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

The plural form of the word "definable" is "definables".

The singular form of the word "definable" is "defineable".