1. That may be omitted.

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

• admissible,
• kmissible,
• lmissible,
• pmissible,
• 0missible,
• 9missible,
• onissible,
• okissible,
• ojissible,
• omussible,
• omjssible,
• omkssible,
• omossible,
• om9ssible,
• om8ssible,
• omisssible,
• Omissable,
• Omisable,
• Omittible,
• Omistable

• Omissive.

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

The plural form of the word "omissible" is "omissibles".

The singular form of the word "Omissible" is "Omission"