Definitions for "Companion Bill"
A bill filed in one chamber that is identical or very similar to a bill filed in the opposite chamber. Companion bills are used to expedite passage as they provide a means for committee consideration of a measure to occur in both houses simultaneously. A companion bill that has passed one house can then be substituted for the companion bill in the second house.
A bill introduced in one chamber that is similar or identical to a bill introduced in the other chamber.
A bill identical in wording introduced in both houses. Administration bills, for example.