gallon


From The Collaborative International Dictionary of English v.0.48:

Gallon \Gal"lon\, n. [OF galon, jalon, LL. galo, galona, fr.
   galum a liquid measure; cf. F. jale large bowl. Cf. Gill a
   measure.]
   A measure of capacity, containing four quarts; -- used, for
   the most part, in liquid measure, but sometimes in dry
   measure.
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   Note: The standart gallon of the Unites States contains 231
         cubic inches, or 8.3389 pounds avoirdupois of distilled
         water at its maximum density, and with the barometer at
         30 inches. This is almost exactly equivalent to a
         cylinder of seven inches in diameter and six inches in
         height, and is the same as the old English wine gallon.
         The beer gallon, now little used in the United States,
         contains 282 cubic inches. The English imperial gallon
         contains 10 pounds avoirdupois of distilled water at
         62? of Fahrenheit, and barometer at 30 inches, equal to
         277.274 cubic inches.
         [1913 Webster]
.

From The Collaborative International Dictionary of English v.0.48:

Imperial \Im*pe"ri*al\, a. [OE. emperial, OF. emperial, F.
   imp['e]rial, fr. L. imperialis, fr. imperium command,
   sovereignty, empire. See Empire.]
   1. Of or pertaining to an empire, or to an emperor; as, an
      imperial government; imperial authority or edict.
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            The last
            That wore the imperial diadem of Rome. --Shak.
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   2. Belonging to, or suitable to, supreme authority, or one
      who wields it; royal; sovereign; supreme. "The imperial
      democracy of Athens." --Mitford.
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            Who, as Ulysses says, opinion crowns
            With an imperial voice.               --Shak.
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            To tame the proud, the fetter'd slave to free,
            These are imperial arts, and worthy thee. --Dryden.
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            He sounds his imperial clarion along the whole line
            of battle.                            --E. Everett.
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   3. Of superior or unusual size or excellence; as, imperial
      paper; imperial tea, etc.
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   Imperial bushel, gallon, etc. See Bushel, Gallon,
      etc.

   Imperial chamber, the, the sovereign court of the old
      German empire.

   Imperial city, under the first German empire, a city having
      no head but the emperor.

   Imperial diet, an assembly of all the states of the German
      empire.

   Imperial drill. (Manuf.) See under 8th Drill.

   Imperial eagle. (Zool.) See Eagle.

   Imperial green. See Paris green, under Green.

   Imperial guard, the royal guard instituted by Napoleon I.
      

   Imperial weights and measures, the standards legalized by
      the British Parliament.
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