if


From The Collaborative International Dictionary of English v.0.48:

If \If\, conj. [OE. if, gif, AS. gif; akin to OFries. ief, gef,
   ef, OS. ef, of, D. of, or, whether, if, G. ob whether, if,
   OHG. oba, ibu, Icel. ef, Goth. iba, ibai, an interrogative
   particle; properly a case form of a noun meaning, doubt (cf.
   OHG. iba doubt, condition, Icel. if, ef, ifi, efi), and
   therefore orig. meaning, on condition that.]
   1. In case that; granting, allowing, or supposing that; --
      introducing a condition or supposition.
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            Tisiphone, that oft hast heard my prayer,
            Assist, if [OE]dipus deserve thy care. --Pope.
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            If thou be the Son of God, command that these stones
            be made bread.                        --Matt. iv. 3.
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   2. Whether; -- in dependent questions.
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            Uncertain if by augury or chance.     --Dryden.
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            She doubts if two and two make four.  --Prior.
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   As if, But if. See under As, But.
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.

From 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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