Biennial usage refers to a timeshare arrangement which allows owners access to their resort every other year. Biennial usage is also often referred to as EOY (every other year.) In cases of right-to-use properties, the value of a biennial agreement is half as valuable as that of an agreement allowing for annual usage. Many biennial arrangements specify odd or even year usage. For example, an even year biennial agreement would have the owner using his or her timeshare in 2006, 2008, 2010 and so on.