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

major \ma"jor\, n. f. major. see major, a.
   1. mil. an officer next in rank above a captain and next
      below a lieutenant colonel; the lowest field officer.
      1913 webster

   2. law a person of full age.
      1913 webster

   3. logic that premise which contains the major term. it its
      the first proposition of a regular syllogism; as: no
      unholy person is qualified for happiness in heaven the
      major. every man in his natural state is unholy minor.
      therefore, no man in his natural state is qualified for
      happiness in heaven conclusion or inference.
      1913 webster

   note: in hypothetical syllogisms, the hypothetical premise is
         called the major.
         1913 webster

   4. ll. see major. a mayor. obs. --bacon.
      1913 webster
see also:
major 

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

major \ma"jor\, l. major, compar. of magnus great: cf. f.
   majeur. cf. master, mayor, magnitude, more, a.
   1. greater in number, quantity, or extent; as, the major part
      of the assembly; the major part of the revenue; the major
      part of the territory.
      1913 webster

   2. of greater dignity; more important. --shak.
      1913 webster

   3. of full legal age; adult. obs.
      1913 webster

   4. mus. greater by a semitone, either in interval or in
      difference of pitch from another tone.
      1913 webster

   major key mus., a key in which one and two, two and
      three, four and five, five and six and seven, make major
      seconds, and three and four, and seven and eight, make
      minor seconds.

   major offense law, an offense of a greater degree which
      contains a lesser offense, as murder and robbery include
      assault.

   major scale mus., the natural diatonic scale, which has
      semitones between the third and fourth, and seventh and
      fourth, and seventh and eighth degrees; the scale of the
      major mode, of which the third is major. see scale, and
      diatonic.

   major second mus., a second between whose tones is a
      difference in pitch of a step.

   major sixth mus., a sixth of four steps and a half step.
      in major keys the third and sixth from the key tone are
      major. major keys and intervals, as distinguished from
      minors, are more cheerful.

   major third mus., a third of two steps.
      1913 webster
see also:
master mayor magnitude more major key major offense 
major scale scale diatonic major second major sixth 
major third 

[3] : WordNet (r) 2.0

major
     adj 1: of greater importance or stature or rank; "a major artist";
            "a major role"; "major highways" ant: minor
     2: greater in scope or effect; "a major contribution"; "a major
        improvement"; "a major break with tradition"; "a major
        misunderstanding" ant: minor
     3: greater in number or size or amount; "a major portion a
        majority of the population"; "ursa major"; "a major
        portion of the winnings" ant: minor
     4: of the field of academic study in which one concentrates or
        specializes; "his major field was mathematics" ant: minor
     5: of a scale or mode; "major scales"; "the key of d major"
        ant: minor
     6: of greater seriousness or danger; "a major earthquake"; "a
        major hurricane"; "a major illness" ant: minor
     7: of full legal age; "major children" ant: minor
     8: of the elder of two boys with the same family name; "jones
        major" syn: majorip
     n 1: a commissioned military officer in the united states army or
          air force or marines; below lieutenant colonel and above
          captain
     2: british statesman who was prime minister from 1990 until
        1997 born in 1943 syn: john major, john r. major, john
        roy major
     3: a university student who is studying a particular field as
        the principal subject; "she is a linguistics major"
     4: the principal field of study of a student at a university;
        "her major is linguistics"
     v : have as one's principal field of study; "she is majoring in
         linguistics"
see also:
minor majorip john major john r. major john roy major 

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

197 moby thesaurus words for "major":
   adc, co, od, a cut above, above, academic specialty, adult, ahead,
   aide, aide-de-camp, area, ascendant, better, big, big-league,
   big-name, big-time, bigger, biggest, bigwig, bigwigged, brigadier,
   brigadier general, capital, capping, captain, chicken colonel,
   chief, chief of staff, chosen, classical education, cock, colonel,
   commandant, commander, commander in chief, commanding officer,
   commissioned officer, company officer, consequential, considerable,
   core curriculum, course, course of study, critical, crucial,
   curriculum, dangerous, discipline, distinguished, dominant,
   dominating, double-barreled, earthshaking, eclipsing, elder,
   eldest, elective, eminent, exceeding, excellent, excelling, exec,
   executive officer, extensive, fell, field, field marshal,
   field officer, finer, first lieutenant, first-born, firstling,
   five-star general, foremost, former, four-star general, general,
   general education, general officer, general studies, generalissimo,
   grand, grave, great, greater, grievous, grown man, grownup,
   heavyweight, hefty, high-powered, higher, humanities, important,
   in ascendancy, in the ascendant, jemadar, junior officer, key,
   key signature, keynote, large, large-scale, larger, legalis homo,
   liberal arts, lieutenant, lieutenant colonel, lieutenant general,
   main, major general, major key, man, marechal, marked, marshal,
   material, mature man, mediant, minor, momentous, name, no chicken,
   notable, noteworthy, of choice, officer, older, oldest, one up on,
   one-star general, orderly officer, outstanding, over, paramount,
   pedal point, predominant, preeminent, primary, prime,
   primogenitary, principal, proseminar, quadrivium, rare,
   refresher course, risaldar, rivaling, scientific education,
   self-important, seminar, senior, senior officer, serious,
   shavetail, significant, sirdar, sizable, specialty, staff officer,
   star, stellar, study, subahdar, subaltern, subdiscipline,
   subdominant, subject, sublieutenant, submediant, substantial,
   subtonic, super, superior, supertonic, surpassing,
   technical education, the old man, the brass, three-star general,
   tonality, tonic, tonic key, top brass, topping, transcendent,
   transcendental, transcending, trivium, two-star general, ugly,
   upper, vital, woman, world-shaking, worst

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

major, persons. one who has attained his full age, and has acquired all his 
civil rights; one who is no longer a minor; an adult. 

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

major. military language. the lowest of the staff officers; a degree higher 
than captain. 

[7] : U.S. Gazetteer Counties (2000)

major -- u.s. county in oklahoma
   population 2000:    7545
   housing units 2000: 3540
   land area 2000:     956.759846 sq. miles 2477.996521 sq. km
   water area 2000:    1.105637 sq. miles 2.863587 sq. km
   total area 2000:    957.865483 sq. miles 2480.860108 sq. km
   located within:       oklahoma ok, fips 40
   location:             36.313820 n, 98.448638 w
   headwords:
    major
    major, ok
    major county
    major county, ok

Major >> M Words
Major, definition of term: Major
major_pag1.html

Major Premise >> M Words
Major Premise, definition of term: Major Premise
major+premise_pag1.html

Major Scale >> M Words
Major Scale, definition of term: Major Scale
major+scale_pag1.html

Major General >> M Words
Major General, definition of term: Major General
major+general_pag1.html

Major Axis >> M Words
Major Axis, definition of term: Major Axis
major+axis_pag1.html

Major Affective >> M Words
Major Affective, definition of term: Major Affective
major+affective_pag1.html

Ursa Major >> U Words
Ursa Major, definition of term: Ursa Major
ursa+major_pag1.html

Canis Major >> C Words
Canis Major, definition of term: Canis Major
canis+major_pag1.html