from Wiktionary, Creative Commons Attribution/Share-Alike License.
- suffix Combined with Latin prefixes for names of integers in order to form names of
powersof a million or of a thousand greater than 1,000,000. Thus we have the names billion, trillion, etc.
- suffix Added to various nonsense syllables to indicate an arbitrarily very large number.
from Wiktionary, Creative Commons Attribution/Share-Alike License
Back-formation from million, billion, trillion, quadrillion , each from French
That's total present value, not benefits per year—oh, and that's an -illion with an "m," which is not normally how things work out in President Obama's Washington.