The Collaborative International Dictionary of English v.0.48:

disregard \dis`re*gard"\, v. t. [imp. & p. p. disregarded; p.
   pr. & vb. n. disregarding.]
   Not to regard; to pay no heed to; to omit to take notice of;
   to neglect to observe; to slight as unworthy of regard or
   notice; as, to disregard the admonitions of conscience.
   [1913 Webster]

         Studious of good, man disregarded fame.  --Blackmore.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Disregard \Dis`re*gard"\, n.
   The act of disregarding, or the state of being disregarded;
   intentional neglect; omission of notice; want of attention;
   slight.
   [1913 Webster]

         The disregard of experience.             --Whewell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disregard
    n 1: lack of attention and due care [syn: disregard,
         neglect]
    2: willful lack of care and attention [syn: disregard,
       neglect]
    v 1: refuse to acknowledge; "She cut him dead at the meeting"
         [syn: ignore, disregard, snub, cut]
    2: bar from attention or consideration; "She dismissed his
       advances" [syn: dismiss, disregard, brush aside, brush
       off, discount, push aside, ignore]
    3: give little or no attention to; "Disregard the errors" [syn:
       neglect, ignore, disregard]