1. The same.

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

• idee,
• idear,
• ideak,
• dem,
• ittem,
• ideams,
• ideat,
• iium,
• idel,
• idewa,
• mideum,
• adems,
• ideho,
• imder,
• idai,
• intem,
• edom,
• iteme,
• nitem,
• ideia

• idea,
• item.

The adjective form of the word "idem" is "idem" itself. It is a Latin word that means "the same".

The plural form of the word "idem" is "eadem".

The singular form of the word "Idem" is "Idem" itself. It is a Latin word that means "the same" or "the very same". It does not have a distinct singular form.