the GNU version of the Collaborative International Dictionary of English
n. Act or process of expelling the exhaust gases from the cylinder by some special means, as, in many four-cycle engines, by utilizing the momentum of the exhaust gases in a long exhaust pipe.
The Century Dictionary and Cyclopedia
n. Street-cleaning; removal of filth.
n. The process of cleansing, especially in internal-combustion motors. See scavenge, 2.
Word Usage
"A lot of his work is focused on the idea of scavenging; crows are a common theme."