On a scale of drawing accuracy, 'rough sketch' would be at one end and 'tight drawing' would be at the other. When an artist executes a tight drawing, every line is carefully placed and controlled (in terms of thickness, pressure, etc) to accurately represent the subject (within the chosen style).
Some artists try to produce a tight drawing straight away but, for many others, a tight drawing is a final drawing after a series of refinements. (It's sometimes compared to an architectural blueprint).
Chris