The Vietnamese word "gia nhập" is a verb that means "to join" or "to adhere to." It is often used when referring to becoming a part of an organization, group, or movement.
In more formal contexts, "gia nhập" can also be used to refer to joining political parties, associations, or international agreements.
While "gia nhập" primarily means "to join," it can also convey the idea of "to accede" in certain contexts, particularly in legal or formal situations where one party agrees to terms set by another.