VMS Help DEFINE, /FORM, Qualifiers, /WIDTH  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /WIDTH=n

    Specifies the physical width of the paper in terms of columns or
    character positions. The parameter n must be an integer from 0 to
    65,535; the default value is 132.

    Any lines exceeding this value wrap if the /WRAP qualifier is in
    effect or are truncated if the /TRUNCATE qualifier is in effect.
    (If both the /NOTRUNCATE and /NOWRAP qualifiers are in effect,
    lines print as far as possible.)

    The /MARGIN=RIGHT qualifier overrides the /WIDTH qualifier when
    determining when to wrap lines of text.