Source : Webster's Revised Unabridged Dictionary (1913)

Logical \Log"ic*al\, a. [Cf. F. logique, L. logicus, Gr. ?.]
   1. Of or pertaining to logic; used in logic; as, logical
      subtilties. --Bacon.

   2. According to the rules of logic; as, a logical argument or
      inference; the reasoning is logical. --Prior.

   3. Skilled in logic; versed in the art of thinking and
      reasoning; as, he is a logical thinker. --Addison.

Source : WordNet®

logical
     adj 1: capable of or reflecting the capability for correct and
            valid reasoning; "a logical mind" [ant: {illogical}]
     2: in accordance with reason or logic; "a logical conclusion"
        [syn: {legitimate}]
     3: marked by an orderly, logical, and aesthetically consistent
        relation of parts; "a logical argument"; "the orderly
        presentation" [syn: {consistent}, {ordered}, {orderly}]
     4: based on known statements or events or conditions; "rain was
        a logical expectation, given the time of year"
     5: capable of thinking and expressing yourself in a clear and
        consistent manner; "a lucid thinker"; "she was more
        coherent than she had been just after the accident" [syn:
        {coherent}, {lucid}]

Source : Free On-Line Dictionary of Computing

logical
     
        (From the technical term "logical device", wherein a physical
        device is referred to by an arbitrary "logical" name) Having
        the role of.  If a person (say, Les Earnest at SAIL) who had
        long held a certain post left and were replaced, the
        replacement would for a while be known as the "logical" Les
        Earnest.  (This does not imply any judgment on the
        replacement).
     
        Compare {virtual}.
     
        At Stanford, "logical" compass directions denote a coordinate
        system in which "logical north" is toward San Francisco,
        "logical west" is toward the ocean, etc., even though logical
        north varies between physical (true) north near San Francisco
        and physical west near San Jose.  (The best rule of thumb here
        is that, by definition, El Camino Real always runs logical
        north-and-south.)  In giving directions, one might say: "To
        get to Rincon Tarasco restaurant, get onto {El Camino Bignum}
        going logical north."  Using the word "logical" helps to
        prevent the recipient from worrying about that the fact that
        the sun is setting almost directly in front of him.  The
        concept is reinforced by North American highways which are
        almost, but not quite, consistently labelled with logical
        rather than physical directions.
     
        A similar situation exists at MIT: Route 128 (famous for the
        electronics industry that has grown up along it) is a
        3-quarters circle surrounding Boston at a radius of 10 miles,
        terminating near the coastline at each end.  It would be most
        precise to describe the two directions along this highway as
        "clockwise" and "counterclockwise", but the road signs all say
        "north" and "south", respectively.  A hacker might describe
        these directions as "logical north" and "logical south", to
        indicate that they are conventional directions not
        corresponding to the usual denotation for those words.  (If
        you went logical south along the entire length of route 128,
        you would start out going northwest, curve around to the
        south, and finish headed due east, passing along one infamous
        stretch of pavement that is simultaneously route 128 south and
        Interstate 93 north, and is signed as such!)
     
        [{Jargon File}]
     
        (1995-01-24)