I thought that the bible was mainly written by Arabs?"Why, cos it's all just written by a bunch of white men?"
I think that a dictionary is somewhat limited as it tends to give a general, common usage, layman's terms definition of any particular word - however this does tend to be a good place to start from when debating the meaning of something."no. because it's an extremely limited way of looking at the world."
On the other hand, in many disciplines words that are in common usage take on a different, subject specific meaning; I think an error that has to be avoided is that of insisting that the specialised meaning which is used in your field ought to take precedence over the commonly accepted definition when you are not conversing with people in the same field.