Adjournment Sine Die
The end of a legislative session (without day, the English translation of the Latin phrase sine die). These adjournments are used to indicate the final adjournment of an annual, biennial, or the two-year session of a legislative ses sion. For Congress, the term refers to the adjournment of an annual or two-year legislative session. In state legislatures that meet only every two years, such as Texas, it refers to adjournment until the next session nearly two years later.
-  US Senate Reference