Remaining as an unused portion or amount.(adjective)
A remnant or an unused portion.(noun)
Food remaining from a previous meal.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "leftover" in a sentence
"P.S., note how about 90% of the so-called political commentators and “analysts” on cable TV are right-wing Republicans leftover from the Nixon regime, the Reagan regime and the Bush regimes?"
"I also engaged in leftover salvage to make twice-cooked pasta and a veggie cheese sauce."
"You can probably trace this to a lot of things at the time: emerging technology and the 3D rat race where everyone is showing off their tech prowess in centimeters and not yards; the assumption leftover from the sparsely-populated 8-bit days that the consumer would spend at least all month with a single game ..."