The DICTIONARY command is used to invoke the Oracle CDD/Repository
  utilities.

  Command Syntax:

  DICTIONARY [option]

  Where option specifies the utility to invoke.  If no option is
  specified, OPERATOR is the default.

  See also REPOSITORY OPERATOR; the DICTIONARY OPERATOR and the
  REPOSITORY OPERATOR commands perform the same function.  Each command
  can be used to invoke the CDO utility.

1  –  OPERATOR

  The DICTIONARY OPERATOR command invokes the CDO utility.  CDO is an
  interactive utility that allows you to define and manage CDO
  dictionaries, define data definitions, perform pieces tracking, and
  verify and fix dictionaries.

  For more information about CDO, type:

  $ DICTIONARY OPERATOR

  At the CDO> prompt, type HELP.