Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. The cardinal number equal to 10 × 10 or 102.
 n. The number in the third position left of the decimal point in an Arabic numeral.
 n. A onehundreddollar bill.
 n. The numbers between 100 and 999: an attendance figure estimated in the hundreds.
 n. An administrative division of some counties in England and the United States.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A numerical value equal to 100 (102), occurring after ninetynine.
 n. A hundreddollar bill.
 n. An administrative subdivision in southern English counties and in other countries.
 n. A hundred runs scored by a batsman.
from the GNU version of the Collaborative International Dictionary of English
 adj. Ten times ten; five score.
 n. The product of ten multiplied by ten, or the number of ten times ten; a collection or sum, consisting of ten times ten units or objects; five score. Also, a symbol representing one hundred units, as 100 or C.
 n. A division of a country in England, supposed to have originally contained a hundred families, or freemen.
from The Century Dictionary and Cyclopedia
 n. The sum of ninetynine and one, or of ten tens; the product of ten multiplied by ten; a collection, body, or sum consisting of ten times ten individuals or units; five score.
 n. In early Teutonic hist., a territorial or administrative district; specifically, in southern and central England, a division or subdivision of a county (a corresponding division in northern England being called a wapentake).
 One more than ninetynine; ten times ten: as, a hundred men; two hundred dollars; a hundred thousand times.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adj. being ten more than ninety
 n. ten 10s
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

But a little consideration will satisfy the people that the effect is the same as if _seven hundred dollars_ were given them from the public Treasury, for which they were at the same time required to pay in taxes, direct or indirect, _eight hundred_.

"Wages will keep on rising, little by little, little by little, as steadily as a tree grows, and at the end of three hundred and forty years more there'll be at least _one_ country where the mechanic's average wage will be _two hundred_ cents a day!"

And this only the aggregate of eight different papers, while Boston alone now has _one hundred and forty_ papers and periodicals of all sorts, and the State of Massachusetts nearly _three hundred_!
The Printer Boy. Or How Benjamin Franklin Made His Mark. An Example for Youth.

Talefre above six hundred  the total, when joined, two thousand five hundred yards; and this enormous mass of solid ice is forced through a narrow neck of the valley, which is, in round numbers, only _nine hundred_ yards wide!

In Havana, in 1833, containing a stationary population of about _one hundred and twenty thousand_, cholera carried off, in a few weeks, if we may credit the public journals, _sixteen thousand_; and, in Matanzas, containing a population of about _twelve thousand_, it was announced that _fifteen hundred_ perished.

But this was not all, the five hundred copies were sold to great advantage, for it was against my will that _five hundred_ copies should be printed, till the printer told me he would take the risk on himself, on the usual terms, at that time, of bookseller and author.

(in 1850) _four hundred and twentyseven_ inhabitants,  and Bigger, which has _seven hundred_.

_quantity_ and _head_, it is obvious that a stream _onehalf_ as big falling _twice_ as far, would still give one horsepower at the wheel; or, a stream of 189 cubic feet a minute falling _ten times_ as far, 30 feet, would give _ten times_ the power, or _ten_ horsepower; a stream falling _one hundred times_ as far would give _one hundred_ horsepower.

A fiery arrow seems to be let loose, which from that moment is destined to travel, without intermission, westwards for three hundred [Footnote: "_Three hundred_":  Of necessity, this scale of measurement, to an American, if he happens to be a thoughtless man, must sound ludicrous.

[Footnote 87: From the original army of the governor having only seven hundred men, I am apt to believe the number of horse in the text ought only to have been two _hundred_.
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