million

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The cardinal number equal to 10⁶.
• noun A million monetary units, such as dollars.
• noun An indefinitely large number.
• noun The common people; the masses.

from The Century Dictionary.

• noun An obsolete or dialectal form of melon.
• noun The number of ten hundred thousand, or a thousand thousand.
• noun The amount of a thousand thousand units of money, as pounds, dollars, or francs: as, he is worth a million; millions have been wasted in preparation for war.
• noun A very great number or quantity, indefinitely.
• [Strictly a collective noun: see hundred.] A thousand times one thousand; ten hundred thousand: as, a capital of a (or one) million dollars; a country of ten million inhabitants.

from the GNU version of the Collaborative International Dictionary of English.

• noun The number of ten hundred thousand, or a thousand thousand, -- written 1,000,000. See the Note under hundred.
• noun A very great number; an indefinitely large number.
• noun The mass of common people; -- with the article the.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The cardinal number 1,000,000: 106.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the number that is represented as a one followed by 6 zeros
• adjective (in Roman numerals, M written with a macron over it) denoting a quantity consisting of 1,000,000 items or units
• noun a very large indefinite number (usually hyperbole)