The Collaborative International Dictionary of English v.0.48:

Iron \I"ron\, v. t. [imp. & p. p. Ironed; p. pr. & vb. n.
   Ironing.]
   [1913 Webster]
   1. To smooth with an instrument of iron; especially, to
      smooth, as cloth, with a heated flatiron; -- sometimes
      used with out.
      [1913 Webster]

   2. To shackle with irons; to fetter or handcuff. "Ironed like
      a malefactor." --Sir W. Scott.
      [1913 Webster]

   3. To furnish or arm with iron; as, to iron a wagon.

   iron out differences resolve differences; settle a dispute.
      [PJC] Ironbark

The Collaborative International Dictionary of English v.0.48:

Ironing \I"ron*ing\, n.
   1. The act or process of smoothing, as clothes, with hot
      flatirons.
      [1913 Webster]

   2. The clothes ironed.
      [1913 Webster]

   Ironing board, a flat board, upon which clothes are laid
      while being ironed.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ironing
    n 1: garments (clothes or linens) that are to be (or have been)
         ironed; "there was a basketful of ironing to do"
    2: the work of using heat to smooth washed clothes in order to
       remove any wrinkles