{ 1 } - always has the same meaning.
{ 2 } - has various related meanings.
{ 3 } - is an ambiguous term with a various distinct meanings.

What exactly "real" means depends on the context and on what distinction we want to make. For example, if I speak of the "real color" of Suzy's hair, I might mean the color it would look in normal lighting (and not in the weird bar-room light). Or I might mean the color that it was before it was dyed.