The Collaborative International Dictionary of English v.0.48:

Condition \Con*di"tion\, n. [F., fr. L. conditio (better
   condicio) agreement, compact, condition; con- + a root
   signifying to show, point out, akin to dicere to say, dicare
   to proclaim, dedicate. See Teach, Token.]
   1. Mode or state of being; state or situation with regard to
      external circumstances or influences, or to physical or
      mental integrity, health, strength, etc.; predicament;
      rank; position, estate.
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            I am in my condition
            A prince, Miranda; I do think, a king. --Shak.
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            And O, what man's condition can be worse
            Than his whom plenty starves and blessings curse?
                                                  --Cowley.
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            The new conditions of life.           --Darwin.
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   2. Essential quality; property; attribute.
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            It seemed to us a condition and property of divine
            powers and beings to be hidden and unseen to others.
                                                  --Bacon.
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   3. Temperament; disposition; character. [Obs.]
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            The condition of a saint and the complexion of a
            devil.                                --Shak.
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   4. That which must exist as the occasion or concomitant of
      something else; that which is requisite in order that
      something else should take effect; an essential
      qualification; stipulation; terms specified.
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            I had as lief take her dowry with this condition, to
            be whipped at the high cross every morning. --Shak.
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            Many are apt to believe remission of sins, but they
            believe it without the condition of repentance.
                                                  --Jer. Taylor.
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   5. (Law) A clause in a contract, or agreement, which has for
      its object to suspend, to defeat, or in some way to
      modify, the principal obligation; or, in case of a will,
      to suspend, revoke, or modify a devise or bequest. It is
      also the case of a future uncertain event, which may or
      may not happen, and on the occurrence or non-occurrence of
      which, the accomplishment, recission, or modification of
      an obligation or testamentary disposition is made to
      depend. --Blount. Tomlins. Bouvier. Wharton.
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   Equation of condition. (Math.) See under Equation.

   On condition or Upon condition (that), used for if in
      introducing conditional sentences. "Upon condition thou
      wilt swear to pay him tribute . . . thou shalt be placed
      as viceroy under him." --Shak.

   Conditions of sale, the terms on which it is proposed to
      sell property by auction; also, the instrument containing
      or expressing these terms.

   Syn: State; situation; circumstances; station; case; mode;
        plight; predicament; stipulation; qualification;
        requisite; article; provision; arrangement. See State.
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Bouvier's Law Dictionary, Revised 6th Ed (1856):

CONDITIONS OF SALE, contracts. The terms upon which the vendor of property
by auction pro poses to sell it; the instrument containing these terms, when
reduced to writing or printing, is also called the conditions of sale.
     2. It is always prudent and advisable that the conditions of sale
should be printed and exposed in the auction room; when so done, they are
binding on both parties, and nothing that is said at the time of sale, to
add to or vary such printed conditions, will be of any avail. 1 H. Bl. 289
12 East, 66 Ves. 330; 15 Ves. 521; 2 Munf. Rep. 119; 1 Desauss. Ch. Rep.
573; 2 Desauss. Ch. R. 320; 11 John. Rep. 555; 3 Camp. 285. Vide forms of
conditions of sale in Babington on Auctions, 233 to 243; Sugd. Vend. Appx.
No. 4. Vide Auction; Auctioneer; Puffer.