The passive form of investing is about reaching your goal by selecting the right asset allocation for your needs, participating in the markets cheaply through index funds and ETFs, and rebalancing the portfolio on occasion to return to its target allocation.

FORBES: Passive Investing Beats the Markets

The exchange also demonstrates the passive voice, the form of speech in which the doer of the action is not stated.

FORBES: From Bogart to Gingrich

The credit equivalents are reported on federal form 8582-CR, Passive Activity Credit Limitations (downloads as a pdf).

FORBES: Taxes From A To Z (2013): P Is For Passive Activity Rules