[1] : The Collaborative International Dictionary of English v.0.48

instruction \instruc"tion\, n. l. instructio: cf. f.
   instruction.
   1913 webster
   1. the act of instructing, teaching, or furnishing with
      knowledge; information.
      1913 webster

   2. that which instructs, or with which one is instructed; the
      intelligence or information imparted; as:
      a precept; information; teachings.
      b direction; order; command. "if my instructions may be
          your guide." --shak.

   3. computers a segment of coded data that is interpreted by
      a computer as a command to perform an operation or series
      of operations. the term instruction is applied to both the
      electronic form of the data as represented in and executed
      by the computer, and to any line of written computer code
      which is interpreted as one instruction by a compiler. a
      computer program is comprised of one or more
      instructions.

   note: instructions as contained in a program are formulated
         in a programming language, which may be an assembly
         language, in which one instruction corresponds to one
         command executed by the coputer, or in a higher-level
         programming language, in which one instruction may
         represent one of many instructions in assembly
         language. higher-level programming languages include,
         for example, fortran, algol, ada, c, "c++", cobol, and
         java; each of these languages have their own
         distinctive set of allowable instructions.

   syn: command, statement, line of code, program line.
        pjc

   syn: education; teaching; indoctrination; information;
        advice; counsel. see education.
        1913 webster
see also:
computer program programming language assembly language higher-level programming language education 

[2] : WordNet (r) 2.0

instruction
     n 1: a message describing how something is to be done; "he gave
          directions faster than she could follow them" syn: direction
     2: the activities of educating or instructing or teaching;
        activities that impart knowledge or skill; "he received no
        formal education"; "our instruction was carefully
        programmed"; "good teaching is seldom rewarded" syn: education,
         teaching, pedagogy, educational activity
     3: the profession of a teacher; "he prepared for teaching while
        still in college"; "pedagogy is recognized as an important
        profession" syn: teaching, pedagogy
     4: computer science a line of code written as part of a
        computer program syn: command, statement, program
        line
see also:
direction education teaching pedagogy educational activity command 
statement program line 

[3] : Moby Thesaurus II by Grady Ward, 1.0

151 moby thesaurus words for "instruction":
   accomplishments, account, acquaintance, acquisition of knowledge,
   acquisitions, admonition, advice, advising, advocacy, announcement,
   assignment, attainments, blue book, brief, briefing, bulletin,
   catechization, caution, caveat, chalk talk, charge, classes,
   coaching, command, commission, communication, communique,
   consultation, council, counsel, data, datum, dictate, didactics,
   direction, directive, directory, discourse, dispatch, disquisition,
   drill, drilling, edification, education, enlightenment, evidence,
   exercise, exhortation, exposition, expostulation, facts,
   factual information, familiarization, gen, general information,
   general orders, guidance, guidebook, guideline, handout, harangue,
   hard information, homework, homily, hortation, idea, illumination,
   incidental information, indoctrination, info, information,
   injunction, instructions, intelligence, knowledge, learning,
   lecture, lecture-demonstration, lesson, lessons, liberal education,
   light, mention, message, monition, moral, moral lesson, morality,
   moralization, notice, notification, object lesson, opinion, order,
   parley, pedagogics, pedagogy, preachment, precept, preparation,
   prescript, prescription, presentation, private teaching,
   programmed instruction, promotional material, proof, proposal,
   publication, publicity, recital, recitation, recommendation,
   reeducation, regulation, release, remonstrance, report, rule,
   schooling, self-instruction, self-teaching, sermon, set task,
   sidelight, skull session, sophistication, spoon-feeding, statement,
   store of knowledge, suggestion, talk, task, teaching, the dope,
   the goods, the know, the scoop, thought, training, transmission,
   tuition, tutelage, tutorage, tutorial, tutoring, tutorship,
   warning, white book, white paper, word

[4] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

instruction, french law. this word signifies the means used and formality 
employed to prepare a case for trial. it is generally applied to criminal 
cases, and is then called criminal, instruction; it is then defined the acts 
and proceedings which tend to prove positively a crime or delict, in order 
to inflict on the guilty person the punishment which he deserves. 

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