agreement — An agreement is a formal decision about future action which is made by two or more countries, groups, or people.
visa — an endorsement issued by an authorized representative of a country and marked in a passport, permitting the passport holder to enter, travel through, or reside in that country for a specified amount of time, for the purpose of tourism, education, employment, etc.
validation — to make valid; substantiate; confirm: Time validated our suspicions.
