1.the idea of something that is perfect; something that one hopes to attain
2.model of excellence or perfection of a kind; one having no equal
3.conforming to an ultimate standard of perfection or excellence; embodying an ideal
4.constituting or existing only in the form of an idea or mental image or conception;
a poem or essay may be typical of its period in idea or ideal content
5.of or relating to the philosophical doctrine of the reality of ideas