Acceptance of an offer or a proposal is the act of saying yes to it or agreeing to it.

If there is acceptance of an idea, most people believe or agree that it is true.

Your acceptance of a situation, especially an unpleasant or difficult one, is an attitude or feeling that you cannot change it and that you must get used to it.

If there is acceptance of a new product, people start to like it and get used to it.

Acceptance of someone into a group means beginning to think of them as part of the group and to act in a friendly way towards them.