any conception existing in the mind as a result of mental understanding, awareness, or activity.
a thought, conception, or notion: That is an excellent idea.
an impression: He gave me a general idea of how he plans to run the department.
an opinion, view, or belief: His ideas on raising children are certainly strange.
a plan of action; an intention: the idea of becoming an engineer.
a groundless supposition; fantasy.
a concept developed by the mind.
a conception of what is desirable or ought to be; ideal.
(cap.)Platonism.Also calledform.an archetype or pattern of which the individual objects in any natural class are imperfect copies and from which they derive their being.