[arbawk]

The most commonly accepted definition of money is: (1) Store of value. (2) Medium of Exchange. (3) Unit of account. This is specified in the article.

[lurquer]

Odd definition. It leaves out demand.

Money is “the most marketable commodity.”

Money is simply that for which a person would trade nearly anything else.

[scatters]

That's what's meant by medium of exchange. You're willing to trade anything for money because you can trade money for anything.