I can't speak to "Latitude" other than it is a sort of jargon for dynamic range. Dynamic Range is fairly precise in definition and is best understood by examining sensitometric curves. Such a curve is just a plot of scene EV value range vs the resulting density range of the developed negative. As Drew implies above, the dynamic range is the number of visible density steps that can be recorded between Dmin and D max. For example a dynamic range that goes from log .05 to log 2.4 (8 stops at log 0.3 per stop) could be considered to have a high dynamic range. Contrast is the slope of the sensitometric plot. Both the dynamic range and contrast are wholly controlled by the exposure and development conditions through the use a zone system approach or something equivalent.

Nate Potter, Austin TX.