1. bringing on suddenly or abruptly; - Example: "the completion of the railroad was the precipitating cause in the extinction of waterborne commerce"
The Collaborative International Dictionary of English v.0.48:
Precipitate \Pre*cip"i*tate\, v. t. [imp. & p. p.
Precipitated; p. pr. & vb. n. Precipitating.]
1. To throw headlong; to cast down from a precipice or
She and her horse had been precipitated to the
pebbled region of the river. --W. Irving.
2. To urge or press on with eager haste or violence; to cause
to happen, or come to a crisis, suddenly or too soon; as,
precipitate a journey, or a conflict.
Back to his sight precipitates her steps. --Glover.
If they be daring, it may precipitate their designs,
and prove dangerous. --Bacon.
3. (Chem.) To separate from a solution, or other medium, in
the form of a precipitate; as, water precipitates camphor
when in solution with alcohol.
The light vapor of the preceding evening had been
precipitated by the cold. --W. Irving.
WordNet (r) 3.0 (2006):
adj 1: bringing on suddenly or abruptly; "the completion of the
railroad was the precipitating cause in the extinction of