What does nicht mean in german?

Answer 1

Nicht wahr can be translated in many ways. the basic translation is not true but it can also be used at the end of a statement, e.g.:

Er ist komisch, nicht wahr? - He's funny, isn't he?

Es ist kalt draußen, nicht wahr? It's cold outside, isn't it?

Answer 2

Depending on context, nicht can be translated as:

not

non-