To cause an event or situation, typically one that is undesirable, to happen suddenly or unexpectedly. The announcement of the new policy precipitated widespread protests.
To cause a substance to be deposited in solid form from a solution. Adding the reagent will precipitate the dissolved minerals from the solution.
To cause moisture to be deposited from the atmosphere, usually as rain, snow, or sleet. The cold front is expected to precipitate heavy rain over the weekend.
(Intransitive, chemistry) To separate from a solution and form a solid deposit. When the temperature dropped, crystals began to precipitate at the bottom of the flask.