Aya Deutsch Dec 16, 2011:

to have an idea In the context of Public International Law the term accession may refer to the act of joining a treaty by a party that didn't take part in its negotiations, as defined by article 15 of the Vienna Convention on the Law of Treaties. It is commonly used as a synonym of ratification, acceptance or approval and occurs whether the treaty is open to the participation of new member states by means of an accession provision or whether all the other members so agree. In the first case accession implies a direct participation of the new member state in the treaty, without any modification of the original agreement. In the latter, accession by a new member state implies a new agreement between all member parties, such as when a new member state joins the European Union (see Enlargement of the European Union).
הסכמה רשמית לחוזה הוא הסבר נוסף שבו נתקלתי