The Collaborative International Dictionary of English v.0.48:

Free \Free\ (fr[=e]), a. [Compar. Freer (-[~e]r); superl.
   Freest (-[e^]st).] [OE. fre, freo, AS. fre['o], fr[imac];
   akin to D. vrij, OS. & OHG. fr[imac], G. frei, Icel.
   fr[imac], Sw. & Dan. fri, Goth. freis, and also to Skr. prija
   beloved, dear, fr. pr[imac] to love, Goth. frij[=o]n. Cf.
   Affray, Belfry, Friday, Friend, Frith inclosure.]
   1. Exempt from subjection to the will of others; not under
      restraint, control, or compulsion; able to follow one's
      own impulses, desires, or inclinations; determining one's
      own course of action; not dependent; at liberty.
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            That which has the power, or not the power, to
            operate, is that alone which is or is not free.
                                                  --Locke.
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   2. Not under an arbitrary or despotic government; subject
      only to fixed laws regularly and fairly administered, and
      defended by them from encroachments upon natural or
      acquired rights; enjoying political liberty.
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   3. Liberated, by arriving at a certain age, from the control
      of parents, guardian, or master.
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   4. Not confined or imprisoned; released from arrest;
      liberated; at liberty to go.
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            Set an unhappy prisoner free.         --Prior.
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   5. Not subjected to the laws of physical necessity; capable
      of voluntary activity; endowed with moral liberty; -- said
      of the will.
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            Not free, what proof could they have given sincere
            Of true allegiance, constant faith, or love.
                                                  --Milton.
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   6. Clear of offense or crime; guiltless; innocent.
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            My hands are guilty, but my heart is free. --Dryden.
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   7. Unconstrained by timidity or distrust; unreserved;
      ingenuous; frank; familiar; communicative.
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            He was free only with a few.          --Milward.
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   8. Unrestrained; immoderate; lavish; licentious; -- used in a
      bad sense.
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            The critics have been very free in their censures.
                                                  --Felton.
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            A man may live a free life as to wine or women.
                                                  --Shelley.
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   9. Not close or parsimonious; liberal; open-handed; lavish;
      as, free with his money.
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   10. Exempt; clear; released; liberated; not encumbered or
       troubled with; as, free from pain; free from a burden; --
       followed by from, or, rarely, by of.
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             Princes declaring themselves free from the
             obligations of their treaties.       --Bp. Burnet.
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   11. Characteristic of one acting without restraint; charming;
       easy.
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   12. Ready; eager; acting without spurring or whipping;
       spirited; as, a free horse.
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   13. Invested with a particular freedom or franchise; enjoying
       certain immunities or privileges; admitted to special
       rights; -- followed by of.
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             He therefore makes all birds, of every sect,
             Free of his farm.                    --Dryden.
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   14. Thrown open, or made accessible, to all; to be enjoyed
       without limitations; unrestricted; not obstructed,
       engrossed, or appropriated; open; -- said of a thing to
       be possessed or enjoyed; as, a free school.
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             Why, sir, I pray, are not the streets as free
             For me as for you?                   --Shak.
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   15. Not gained by importunity or purchase; gratuitous;
       spontaneous; as, free admission; a free gift.
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   16. Not arbitrary or despotic; assuring liberty; defending
       individual rights against encroachment by any person or
       class; instituted by a free people; -- said of a
       government, institutions, etc.
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   17. (O. Eng. Law) Certain or honorable; the opposite of
       base; as, free service; free socage. --Burrill.
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   18. (Law) Privileged or individual; the opposite of common;
       as, a free fishery; a free warren. --Burrill.
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   19. Not united or combined with anything else; separated;
       dissevered; unattached; at liberty to escape; as, free
       carbonic acid gas; free cells.
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   Free agency, the capacity or power of choosing or acting
      freely, or without necessity or constraint upon the will.


   Free bench (Eng. Law), a widow's right in the copyhold
      lands of her husband, corresponding to dower in freeholds.


   Free board (Naut.), a vessel's side between water line and
      gunwale.

   Free bond (Chem.), an unsaturated or unemployed unit, or
      bond, of affinity or valence, of an atom or radical.

   Free-borough men (O.Eng. Law). See Friborg.

   Free chapel (Eccles.), a chapel not subject to the
      jurisdiction of the ordinary, having been founded by the
      king or by a subject specially authorized. [Eng.]
      --Bouvier.

   Free charge (Elec.), a charge of electricity in the free or
      statical condition; free electricity.

   Free church.
       (a) A church whose sittings are for all and without
           charge.
       (b) An ecclesiastical body that left the Church of
           Scotland, in 1843, to be free from control by the
           government in spiritual matters.

   Free city, or Free town, a city or town independent in
      its government and franchises, as formerly those of the
      Hanseatic league.

   Free cost, freedom from charges or expenses. --South.

   Free and easy, unconventional; unrestrained; regardless of
      formalities. [Colloq.] "Sal and her free and easy ways."
      --W. Black.

   Free goods, goods admitted into a country free of duty.

   Free labor, the labor of freemen, as distinguished from
      that of slaves.

   Free port. (Com.)
       (a) A port where goods may be received and shipped free
           of custom duty.
       (b) A port where goods of all kinds are received from
           ships of all nations at equal rates of duty.

   Free public house, in England, a tavern not belonging to a
      brewer, so that the landlord is free to brew his own beer
      or purchase where he chooses. --Simmonds.

   Free school.
       (a) A school to which pupils are admitted without
           discrimination and on an equal footing.
       (b) A school supported by general taxation, by
           endowmants, etc., where pupils pay nothing for
           tuition; a public school.

   Free services (O.Eng. Law), such feudal services as were
      not unbecoming the character of a soldier or a freemen to
      perform; as, to serve under his lord in war, to pay a sum
      of money, etc. --Burrill.

   Free ships, ships of neutral nations, which in time of war
      are free from capture even though carrying enemy's goods.


   Free socage (O.Eng. Law), a feudal tenure held by certain
      services which, though honorable, were not military.
      --Abbott.

   Free States, those of the United States before the Civil
      War, in which slavery had ceased to exist, or had never
      existed.

   Free stuff (Carp.), timber free from knots; clear stuff.

   Free thought, that which is thought independently of the
      authority of others.

   Free trade, commerce unrestricted by duties or tariff
      regulations.

   Free trader, one who believes in free trade.

   To make free with, to take liberties with; to help one's
      self to. [Colloq.]

   To sail free (Naut.), to sail with the yards not braced in
      as sharp as when sailing closehauled, or close to the
      wind.
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WordNet (r) 3.0 (2006):

free thought
    n 1: the form of theological rationalism that believes in God on
         the basis of reason without reference to revelation [syn:
         deism, free thought]