Source : Webster's Revised Unabridged Dictionary (1913)

Indirect \In`di*rect"\, a. [Pref. in- not + direct: cf. F.
   indirect.]
   1. Not direct; not straight or rectilinear; deviating from a
      direct line or course; circuitous; as, an indirect road.

   2. Not tending to an aim, purpose, or result by the plainest
      course, or by obvious means, but obliquely or
      consequentially; by remote means; as, an indirect
      accusation, attack, answer, or proposal.

            By what bypaths and indirect, crooked ways I met
            this crown.                           --Shak.

   3. Not straightforward or upright; unfair; dishonest; tending
      to mislead or deceive.

            Indirect dealing will be discovered one time or
            other.                                --Tillotson.

   4. Not resulting directly from an act or cause, but more or
      less remotely connected with or growing out of it; as,
      indirect results, damages, or claims.

   5. (Logic & Math.) Not reaching the end aimed at by the most
      plain and direct method; as, an indirect proof,
      demonstration, etc.

   {Indirect claims}, claims for remote or consequential damage.
      Such claims were presented to and thrown out by the
      commissioners who arbitrated the damage inflicted on the
      United States by the Confederate States cruisers built and
      supplied by Great Britain.

   {Indirect demonstration}, a mode of demonstration in which
      proof is given by showing that any other supposition
      involves an absurdity (reductio ad absurdum), or an
      impossibility; thus, one quantity may be proved equal to
      another by showing that it can be neither greater nor
      less.

   {Indirect discourse}. (Gram.) See {Direct discourse}, under
      {Direct}.

   {Indirect evidence}, evidence or testimony which is
      circumstantial or inferential, but without witness; --
      opposed to {direct evidence}.

   {Indirect tax}, a tax, such as customs, excises,

Demonstration \Dem`on*stra"tion\, n. [L. demonstratio: cf. F.
   d['e]monstration.]
   1. The act of demonstrating; an exhibition; proof;
      especially, proof beyond the possibility of doubt;
      indubitable evidence, to the senses or reason.

            Those intervening ideas which serve to show the
            agreement of any two others are called ``proofs;''
            and where agreement or disagreement is by this means
            plainly and clearly perceived, it is called
            demonstration.                        --Locke.

   2. An expression, as of the feelings, by outward signs; a
      manifestation; a show.

            Did your letters pierce the queen to any
            demonstration of grief?               --Shak.

            Loyal demonstrations toward the prince. --Prescott.

   3. (Anat.) The exhibition and explanation of a dissection or
      other anatomical preparation.

   4. (Mil.) a decisive exhibition of force, or a movement
      indicating an attack.

   5. (Logic) The act of proving by the syllogistic process, or
      the proof itself.

   6. (Math.) A course of reasoning showing that a certain
      result is a necessary consequence of assumed premises; --
      these premises being definitions, axioms, and previously
      established propositions.

   {Direct}, or {Positive}, {demonstration} (Logic & Math.), one
      in which the correct conclusion is the immediate sequence
      of reasoning from axiomatic or established premises; --
      opposed to

   {Indirect}, or {Negative}, {demonstration} (called also
      {reductio ad absurdum}), in which the correct conclusion
      is an inference from the demonstration that any other
      hypothesis must be incorrect.

Source : WordNet®

indirect
     adj 1: having intervening factors or persons or influences;
            "reflection from the ceiling provided a soft indirect
            light"; "indirect evidence"; "an indirect cause"
     2: not direct in spatial dimension; not leading by a straight
        line or course to a destination; "sometimes taking an
        indirect path saves time"; "must take an indirect couse in
        sailing" [ant: {direct}]
     3: descended from a common ancestor but through different
        lines; "cousins are collateral relatives"; "an indirect
        descendant of the Stuarts" [syn: {collateral}] [ant: {lineal}]
     4: extended senses; not direct in manner or language or
        behavior or action; "making indirect but legitimate
        inquiries"; "an indirect insult"; "doubtless they had some
        indirect purpose in mind"; "though his methods are
        indirect they are not dishonest"; "known as a shady
        indirect fellow" [ant: {direct}]
     5: not as a direct effect or consequence; "indirect benefits";
        "an indirect advantage"