WordNet (r) 3.0 (2006):

WYSIWYG
    adj 1: relating to or being a word processing system that prints
           the text exactly as it appears on the computer screen

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

WYSIWYG
       What You See Is What You Get (DTP)















The Jargon File (version 4.4.7, 29 Dec 2003):

WYSIWYG
 /wiz'ee?wig/, /wiss?ee?wig/, adj.

    [Traced to Flip Wilson's ?Geraldine? character c.1970] Describes a user
    interface under which ?What You See Is What You Get?, as opposed to one
    that uses more-or-less obscure commands that do not result in immediate
    visual feedback. True WYSIWYG in environments supporting multiple fonts or
    graphics is a rarely-attained ideal; there are variants of this term to
    express real-world manifestations including WYSIAWYG (What You See Is
    Almost What You Get) and WYSIMOLWYG (What You See Is More or Less What You
    Get). All these can be mildly derogatory, as they are often used to refer
    to dumbed-down user-friendly interfaces targeted at non-programmers; a
    hacker has no fear of obscure commands (compare WYSIAYG). On the other
    hand, EMACS was one of the very first WYSIWYG editors, replacing
    (actually, at first overlaying) the extremely obscure, command-based TECO
    . See also WIMP environment. [Oddly enough, WYSIWYG made it into the
    1986 supplement to the OED, in lower case yet. ?ESR]

    X


The Free On-line Dictionary of Computing (30 December 2018):

What You See Is What You Get
WYSIWYG
WYSWYG

    (WYSIWYG) /wiz'ee-wig/ Describes a user interface for
   a document preparation system under which changes are
   represented by displaying a more-or-less accurate image of the
   way the document will finally appear, e.g. when printed.  This
   is in contrast to one that uses more-or-less obscure commands
   that do not result in immediate visual feedback.

   True WYSIWYG in environments supporting multiple fonts or
   graphics is rarely-attained; there are variants of this term
   to express real-world manifestations including WYSIAWYG (What
   You See Is *Almost* What You Get) and WYSIMOLWYG (What You See
   Is More or Less What You Get).  All these can be mildly
   derogatory, as they are often used to refer to dumbed-down
   user-friendly interfaces targeted at non-programmers; a
   hacker has no fear of obscure commands (compare WYSIAYG).
   On the other hand, Emacs was one of the very first WYSIWYG
   editors, replacing (actually, at first overlaying) the
   extremely obscure, command-based TECO.

   See also WIMP.

   (1999-03-03)