\Non\, a.
No; not. See {No}, a. --Chaucer.

\Non-\ [L. non, OL. noenu, noenum, fr. neoenum, lit., not
one. See {None}.]
A prefix used in the sense of not; un-; in-; as in
nonattention, or non-attention, nonconformity, nonmetallic,
nonsuit.
Note: The prefix non- may be joined to the leading word by
      means of a hyphen, or, in most cases, the hyphen may be
      dispensed with. The list of words having the prefix
      non- could easily be lengthened.