Conspire: c.1300, from O.Fr. conspirer, from L. conspirare "to agree, unite, plot," lit. "to breathe together," from com- "together" + spirare "to breathe" (see spirit). Conspiracy is from 1386; conspiracy theory is from 1909.
It occurs to me that this may be a philosophy I should take on in life. Today I would like to drop out and travel across the continent reading Jack Kerouac.