Going to dinner
I found out tha tin case of invitation to a dinner people say:
I'm glad to invite you OVER for dinner
or
I'm glad if you come OVER for dinner

Why this OVER is neccesary? Without OVER the meaning still remains the same isn't it?

Question

Going to dinner
I found out tha tin case of invitation to a dinner people say:
I'm glad to invite you OVER for dinner 
or
I'm glad if you come OVER for dinner

Why this OVER is neccesary? Without OVER the meaning still remains the same isn't it?

Answer

It is true that they both make sense without the word "over", but if I were to say "I'm glad if you come for dinner" there is a little bit of ambiguity about where dinner would be. Dinner could be at a restaurant, at a friends house, anything. Saying "I'm glad if you come over for dinner" most of the time implies it would be at the house of the person speaking, unless another place was specified earlier in the conversation.

Answer

We can also say 'Come round for dinner' , with exactly the same meaning.

Answer

In this example, "over" suggests a crossing from one place to another. From your place to mine.

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