An illustration is a decoration, Depending on the purpose, illustration may be expressive, stylised, realistic or highly technical. Specialist areas include. Dec 24, · These images are for illustration purposes only-meaning? Do you ever wonder what the purpose of a meaningless "War on Terror" is, I mean what is that?Status: Resolved. for illustration purpose only synonyms, antonyms, English dictionary, English language, definition, see also 'illusion',illustrative',illustrate',illustrated', Reverso dictionary, English synonym, English vocabulary.