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forceten said..
Your first sentence , semantics, a study of the cognitive structure of meaning, does translate loosely to culture , or way of life.
a way of life will differ from a farmer in Iowa to a accountant in Boston. I never felt that a geographic difference prevents common courtesy among those with a similar interest , if that means staying alive ( brothers in arms) or windsurfing the same break.
Have you visited OZ? A slight difference in meaning of the same words can lead to big misunderstandings.
Something that's courteous in one country could be an insult in another.
A lot of Yanks don't get aussie humour, and can take offence where none was meant. And vice versa