Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 adj. Of, relating to, or characteristic of a residue.
 adj. Remaining as a residue.
 n. The quantity left over at the end of a process; a remainder.
 n. A payment made to a performer, writer, or director for each repeat showing of a recorded television show or commercial. Often used in the plural.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 adj. Of, relating to, or remaining as a residue; left over.
 n. A remainder left over at the end of some process.
 n. Payments made to performers, writers and directors when a recorded broadcast is repeated.
from the GNU version of the Collaborative International Dictionary of English
 adj. Pertaining to a residue; remaining after a part is taken.
 n. The difference of the results obtained by observation, and by computation from a formula.
 n. The difference between the mean of several observations and any one of them.
from The Century Dictionary and Cyclopedia
 Pertaining to or having the character of a residuum; remaining.
 A chronic abscess in which the contents have been mostly absorbed.
 In such cases there is said to be electric absorption. It is doubtless due to the fact that the solid dielectric does not immediately recover from the strain resulting from the electric stress. Also called dielectric afterworking.
 n. A remainder; especially, the remainder of an observed quantity, after subtracting so much as can be accounted for in a given way.
 n. The integral of a function round a closed contour in the plane of imaginary quantity inclosing a value for which the function becomes infinite, this integral being divided by 2PI.
 n. A system of points which, together with another system of points of which it is said to be the residual, makes up all the intersections of a given curve with a plane cubic curve.
 n. In mathematics, the difference between a variate and the mean of the set or series.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. (often plural) a payment that is made to a performer or writer or director of a television show or commercial that is paid for every repeat showing
 n. something left after other parts have been taken away
 adj. relating to or indicating a remainder
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

We all know by now the term residual income I hope?

So what's neat about that is what we call a residual haunting.

This is what we call a residual income, which means you will get paid time and time again for work you do once.
WN.com  Articles related to Rabies toll up as dogs roam holiday haven

The 1 percent of sightings, which he calls residual UFOs, have attracted his attention.

On the back end, Disney paid out $12.6 million in residual fees and figured in $17.2 million for overhead and $41.8 million for debt service  for a total negative cost of $265.3 million, more than double the studio's take of the boxoffice receipts.
Economics of Movies, Arnold Kling  EconLog  Library of Economics and Liberty

Third: a useful bridge remains – this has significant longterm residual value.

Maybe they believed they should get a residual from the webisodes in addition to upfront payment?

Sinus cold thing, and oh so tired, a lovely residual from the glandular fever i had a couple of years back.

Be sure your doctor tells you as much as is known about possible longterm residual effects from taking an experimental drug or treatment.

But actually, I ` m telling you, people were furious with that because of the longterm residual aftereffects that are going to last for many, many years because there are people in the Middle East that are not going to believe this is not true.
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