They are not same in/at/on meaning.

[sb70012]

They are not same in meaning.
They are not same at meaning.
They are not same on meaning.

Hi,
Are all correct? For example suppose that we are thinking about the meaning of two words.

Thank you.

 

[Rover_KE]

Only #1 is correct.

 

[MikeNewYork]

They are not same in meaning.
They are not same at meaning.
They are not same on meaning.

Hi,
Are all correct? For example suppose that we are thinking about the meaning of two words.

Thank you.

The second and third are incorrect. The first one is possible (if you place "the" before "same), but there are better ways to phrase that thought.
They don't have the same meaning.