attentive, aware, or careful (usually followed by of ): mindful of one's responsibilities.

1375–1425; late Middle English mindeful. See mind, -ful

mindfully, adverb
mindfulness, noun

heedful, thoughtful, regardful.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mindful (ˈmaɪndfʊl)
adj (usually postpositive and foll by of)
keeping aware; heedful: mindful of your duties

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

mid-14c., from mind + -ful. Related: Mindfulness.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We must be mindful of the possibility of damage to the natural balance of the
In the dispute over busing, moreover, the white majority mindful of its own
  interests has proved to be both national and powerful.
Understanding these models means being mindful of their limitations.
They are mindful that they can do nothing to stop a military blockade.
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