Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. A symbol or mark used to represent a number.
 n. The numbers, usually the last two digits, indicating by year a graduating class in a school or college.
 adj. Of, relating to, or representing numbers.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A symbol that is not a word and represents a number, such as the Arabic numerals 1, 2, 3 and the Roman numerals I, V, X, L.
 n. A word or symbol representing a number.
from the GNU version of the Collaborative International Dictionary of English
 adj. Of or pertaining to number; consisting of number or numerals.
 adj. Expressing number; representing number.
 n. A figure or character used to express a number
 n. A word expressing a number.
from The Century Dictionary and Cyclopedia
 Pertaining to number; consisting of numbers.
 Expressing number; representing number: as, numeral letters or characters, such as V or 5 for five.
 Synonyms Numeral, Numerical. Numeral is more concrete than numerical: as, numeral adjectives or letters; numerical value, difference, equality, or equations.
 n. One of the series of words used in counting; a cardinal number.
 n. A figure or character used to express a number: as, the Arabic numerals, 1, 2, 3, etc., or the Roman numerals, I, V, X, L, C, D, M.
 n. In grammar, a word expressing a number or some relation of a number.
 n. In musical notation:
 n. An Arabic or Roman figure indicating a tone of the scale, as 1 for the tonic or do, 2 for re, 3 for mi, etc.
 n. One of the figures used in thoroughbass, by which the constitution of a chord is indicated with reference to the bass tone or to the keychord.
 n. In the AngloSaxon Ch., a calendar or directory telling the variations in the canonical hours and the mass caused by saints' days and festivals.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adj. of or relating to or denoting numbers
 n. a symbol used to represent a number
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

Each numeral is outlined by silvered disks of reflecting material, and floodlights play upon the figures to make them show up clearly at a distance.

Not to mention the fact that the site's example starts a sentence with a numeral, which is wrong.

V (KI) n, where the second occurrence of n indicates a numeral, that is, the combinator that represents n.

I was really excited about the bills, but then realized they looked strange  on the bottom left corner of one of them the numeral was a '2' rather than a '50', and the upper left numeral was a '1'.

Although the numerals used by the Babylonians were cumbersome (due, per  haps, to the necessity of having to adapt them to the use of the stylus and baked clay media), their place value system in which the “value” of a single digit depended on its position (“place”) within the numeral was the same as that used in the decimal system.

We still call our numeral system Arabic despite the fact that the Arabs do not use it anymore.

Which brings me actually to my Romans numeral which is 23.

The value of each card on the numeral line must be _added_ to that of the card on the balcony immediately above it, and you must again transfer from the ground packets to the numeral line any cards whose value corresponds with the addition thus made, it being understood that any card taken from the ground packet must always be placed on the numeral which is exactly underneath the balcony card to whose value it is added.

ThinkProgress attended the event and observed a variant of the original revolutionary war flag, which depicts a roman numeral II within the original thirteen stars, widely distributed throughout Brown party.

Technically, of course, Vidic's surname does not form a Roman numeral, rather it comprises them.
The Knowledge  Which footballers have been mentioned in parliament?  John Ashdown
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