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The Collaborative International Dictionary
Major key

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.

  2. Of greater dignity; more important.
    --Shak.

  3. Of full legal age; adult. [Obs.]

  4. (Mus.) Greater by a semitone, either in interval or in difference of pitch from another tone.

    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.

Wiktionary
major key

n. (context music English) A musical key based upon a major scale.

WordNet
major key

n. a key whose harmony is based on the major scale [syn: major mode]

Wikipedia
Major Key (album)

Major Key (stylized as Major ????) is the ninth studio album by DJ Khaled. It was released on July 29, 2016 by Epic Records and We the Best Music Group. The album features guest appearances from Future, Big Sean, Rick Ross, Jay Z, Drake, Nas, Kendrick Lamar, Betty Wright, J. Cole, Bryson Tiller, Nicki Minaj, Chris Brown, August Alsina, Jeremih, Kodak Black, Jeezy, French Montana, YG, Yo Gotti, Gucci Mane, 2 Chainz, Jadakiss, Fabolous, Fat Joe, Busta Rhymes, Kent Jones, Travis Scott, Lil Wayne, Meghan Trainor, Wiz Khalifa, Wale and Mavado. The album produced singles, " For Free", " I Got the Keys", " Holy Key" and " Do You Mind."

Usage examples of "major key".

Protective resemblance has always been a major key to our survival.

But what Roland and Susannah and Patrick heard in a major key, Mordred heard in a minor.