ga·lac·tic

[guh-lak-tik]
adjective
1.
Astronomy.
a.
of or pertaining to a galaxy.
b.
of or pertaining to the Milky Way.
2.
immense; huge; vast: a problem of galactic proportions.
3.
Physiology. pertaining to or stimulating the secretion of milk.

Origin:
1830–40; < Greek galaktikós milky. See galact-, -ic

non·ga·lac·tic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
galactic (ɡəˈlæktɪk) [Click for IPA pronunciation guide]
 
adj
1.  astronomy of or relating to a galaxy, esp the Galaxy: the galactic plane
2.  med of or relating to milk
 
[C19: from Greek galaktikos; see galaxy]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Galactic is always a great word to know.
So is prepuberty. Does it mean:
an innate periodicity in an organism's physiological processes like sleep and wake cycles
the period of life just prior to sexual maturation
Etymonline
Word Origin & History

galactic
1839, from L.L. galacticus, from galaxias (see galaxy).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

galactic ga·lac·tic (gə-lāk'tĭk)
adj.

  1. Relating to milk.

  2. Promoting the flow of milk.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
When galactic cosmic rays enter the atmosphere, they smash into nuclei forming
  various kinds of exotic by-products.
These occurrences were once considered impossible, but they have turned out to
  be common in certain galactic neighborhoods.
Current data cannot reveal how far away it lies in the direction of the
  galactic center.
In the prevailing, so-called hierarchical view of galactic growth, galaxies
  merge over time to form ever-larger galactic bodies.
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