Source : Webster's Revised Unabridged Dictionary (1913)

Mindful \Mind"ful\, a.
   Bearing in mind; regardful; attentive; heedful; observant.

         What is man, that thou art mindful of him? --Ps. viii.
                                                  4.

         I promise you to be mindful of your admonitions.
                                                  --Hammond.
   -- {Mind"ful*ly}, adv. -- {Mind"ful*ness}, n.

Source : WordNet®

mindfulness
     n : the trait of staying aware of (paying close attention to)
         your responsibilities [syn: {heedfulness}] [ant: {unmindfulness},
          {unmindfulness}]