verb (used with object)
to increase the height of; make higher.
to increase the degree or amount of; augment: Cézanne's death heightened the value of his paintings.
to strengthen, deepen, or intensify: to heighten the plot of a story; to heighten one's awareness or appreciation; to heighten one's suffering.
to bring out the important features of, as in a drawing: to heighten a picture with Chinese white.
verb (used without object)
to become higher.
to increase: The tension heightened as the enemy forces advanced.
to brighten or become more intense.

1515–25; height + -en1

heightener, noun
unheightened, adjective

1. See elevate.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heighten (ˈhaɪtən)
1.  to make or become high or higher
2.  to make or become more extreme or intense

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
As the value of the property heightened, taxes increased, forcing many to leave
  the area.
Enrollment chiefs huddled with presidents and trustees, bracing for an era of
  heightened uncertainty.
Today's researchers are working in an environment of heightened public concern
  for the safety of human subjects.
It was not an unpleasant thing for her at all and in fact she came away with a
  heightened respect for the principle of the school.
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