The Collaborative International Dictionary of English v.0.48:

Laissez faire \Lais`sez" faire"\n. [F., let alone.]
   Noninterference; -- an axiom of some political economists,
   deprecating interference of government by attempts to foster
   or regulate commerce, manufactures, etc., by bounty or by
   restriction; as, the doctrine of laissez faire; the laissez
   faire system of government.
   [1913 Webster]

WordNet (r) 3.0 (2006):

laissez faire
    n 1: the doctrine that government should not interfere in
         commercial affairs [syn: individualism, laissez faire]

Moby Thesaurus II by Grady Ward, 1.0:

165 Moby Thesaurus words for "laissez faire":
   a wise passiveness, autarky, bimetallism, capitalism,
   capitalistic system, contemplation, contemplative,
   contemplative life, culpa, culpable negligence, culpably negligent,
   default, derelict, dereliction, disregard, do-nothing,
   do-nothing policy, do-nothingism, do-nothingness, dormancy,
   dormant, economic self-sufficiency, failure, finance capitalism,
   free competition, free economy, free enterprise, free trade,
   free-enterprise economy, free-enterprise system, governmentalism,
   idle, idleness, immobile, immobility, inaction, inactive,
   inactivity, inadvertence, inadvertency, inadvertent, inattention,
   inattentive, individualism, indolence, inert, inertia, inertness,
   isolationism, laches, laissez-aller, laissez-faireism, lapse, lax,
   laxity, laxness, let-alone policy, let-alone principle, liberalism,
   line, localism, loose, looseness, managed currency, meditation,
   meditative, motionless, neglect, neglectful, neglectfulness,
   neglecting, negligence, negligent, neuter, neutral, neutralism,
   neutrality, neutralness, nonfeasance, noninterference,
   noninterfering, nonintervention, noninvolvement, nonparticipation,
   nonperformance, nonresistance, nonrestriction, nonrestrictive,
   nonviolence, nonviolent resistance, nullification, off-guard,
   omission, overlooking, overly permissive, oversight, pacifism,
   paralysis, paralytic, paralyzed, party line, party principle,
   passive, passive resistance, passive self-annihilation,
   passiveness, passivism, passivity, permissive, permissiveness,
   planned economy, policy, polity, poor stewardship, position,
   price supports, private enterprise, private ownership,
   private sector, procrastinating, procrastination, protection,
   protectionism, public policy, pump-priming, quiescence, quiescent,
   quietism, quietist, quietistic, relaxed, remiss, remissness,
   rugged individualism, scamping, sectionalism,
   self-regulating market, skimping, slack, slackness, slight,
   slighting, slurring, stagnancy, stagnant, stagnating, stagnation,
   standpat, standpattism, stasis, state capitalism, static,
   stationary, uncircumspect, unguarded, unrigorous, unrigorousness,
   unwary, unwatchful, vegetable, vegetation, vegetative,
   vita contemplativa, waiting game, watching and waiting