As has been alluded to money laundering is a generic term for the process by which criminals make the proceeds of crime appear to be legitimately obtained.
Various jurisdictions have controls in place to identify suspicious transactions, however these are generally the responsibility of financial institutions to monitor and report - for example, many countries require financial institutions to report transactions over a certain threshold value.
However, a critical element of money laundering is that the funds have been obtained as a result of crime. If the money is obtained legally, then no money laundering can occur.
While the United States Treasury have provided certain descriptions of money laundering, by categorising actions that usually occur in the process, you usually don't need to undertake any specific actions, nor does the money need to be of any specified value: someone could just as easily give you $10 to bet on a coin toss, and if that were the proceeds of crime, it would still constitute money laundering (though you'd be unlikely to be prosecuted for it).
So, in short, and in answer to your question: it's only money laundering if the money is a proceed of crime.