In the United States Senate

United States Senate

The United States Senate is the upper house of the bicameral legislature of the United States, and together with the United States House of Representatives comprises the United States Congress. The composition and powers of the Senate are established in Article One of the U.S. Constitution. Each...

, an engrossed bill is the official copy of a bill

Bill (proposed law)

A bill is a proposed law under consideration by a legislature. A bill does not become law until it is passed by the legislature and, in most cases, approved by the executive. Once a bill has been enacted into law, it is called an act or a statute....

 or joint resolution

Joint resolution

In the United States Congress, a joint resolution is a legislative measure that requires approval by the Senate and the House and is presented to the President for his/her approval or disapproval, in exactly the same case as a bill....

 passed by the Senate

United States Senate

The United States Senate is the upper house of the bicameral legislature of the United States, and together with the United States House of Representatives comprises the United States Congress. The composition and powers of the Senate are established in Article One of the U.S. Constitution. Each...

 and certified by the Secretary of the Senate

Secretary of the United States Senate

The Secretary of the Senate is an elected officer of the United States Senate. The Secretary supervises an extensive array of offices and services to expedite the day-to-day operations of that body...

.

Used by both Chambers of the United States Congress, it is the final version of a bill passed by one chamber (the Senate and/or the House of Representatives). It includes any floor amendments.

source: http://www.c-span.org/guide/congress/glossary/engross.htm