The process of printing on both sides of the printed-on material during its single pass through the printing press.
A sequence obtained by adding or multiplying each term by a constant.
chord progression
The act of moving from one thing to another.
The act of moving forward or proceeding in a course; motion onward.
Development, increase, evolution.
The making an exercise more exerting by manipulating the details of its performance like loaded weight, range of motion, angle, speed.