completely engrossed in thought; absorbed.
previously occupied; taken; filled.
Biology. already used as a name for some species, genus, etc., and not available as a designation for any other.

1835–45; preoccupy + -ed2

preoccupiedly, adverb
preoccupiedness, noun
unpreoccupied, adjective

1. busy; concentrating. Unabridged


verb (used with object), preoccupied, preoccupying.
to absorb or engross to the exclusion of other things.
to occupy beforehand or before others.

1560–70; pre- + occupy

preoccupier, noun
overpreoccupy, verb (used with object), overpreoccupied, overpreoccupying. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To preoccupied
World English Dictionary
preoccupied (priːˈɒkjʊˌpaɪd)
1.  engrossed or absorbed in something, esp one's own thoughts
2.  already or previously occupied
3.  biology (of a taxonomic name) already used to designate a genus, species, etc

preoccupy (priːˈɒkjʊˌpaɪ)
vb , -pies, -pying, -pied
1.  to engross the thoughts or mind of
2.  to occupy before or in advance of another
[C16: from Latin praeoccupāre to capture in advance, from prae before + occupāre to seize, take possession of]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Few people are more preoccupied with their health than business travelers.
We're too preoccupied by our own reputations to think about what others are
  doing in their own little empires.
Yet the public has been getting less and less preoccupied with both.
Army, he was probably too preoccupied to scale the granite domes.
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