For purposes of sections 682 to 688 of this title—
(1) “deferral of budget authority” includes—
withholding or delaying the obligation or expenditure of budget authority (whether by establishing reserves or otherwise) provided for projects or activities; or
“rescission bill” means a bill or joint resolution which only rescinds, in whole or in part, budget authority proposed to be rescinded in a special message transmitted by the President under section 683 of this title, and upon which the Congress completes action before the end of the first period of 45 calendar days of continuous session of the Congress after the date on which the President’s message is received by the Congress;
continuity of a session of the Congress shall be considered as broken only by an adjournment of the Congress sine die, and the days on which either House is not in session because of an adjournment of more than 3 days to a day certain shall be excluded in the computation of the 45-day period referred to in paragraph (3) of this section and in section 683 of this title, and the 25-day periods referred to in sections 687 and 688(b)(1) of this title. If a special message is transmitted under section 683 of this title during any Congress and the last session of such Congress adjourns sine die before the expiration of 45 calendar days of continuous session (or a special message is so transmitted after the last session of the Congress adjourns sine die), the message shall be deemed to have been retransmitted on the first day of the succeeding Congress and the 45-day period referred to in paragraph (3) of this section and in section 683 of this title (with respect to such message) shall commence on the day after such first day.