In thought or imagination as opposed to in reality; as an abstract concept; conceptually.

Full of ideas.

Having a specified style or number of ideas.

(philosophy) An abstract archetype of a given thing, compared to which real-life examples are seen as imperfect approximations; pure essence, as opposed to actual examples.

(emphatic) I don't know. / Indicates that the speaker is completely ambivalent about something.

plural of idea

To not know at all. / To be mistaken; to not have a correct idea.

(psychiatry) A false or exaggerated and sustained belief that is maintained with much less than delusional intensity (i.e., the individual is able to acknowledge the possibility that the ideas may not be true). The belief is accompanied by a strong emotional response, that take priority over all other mental activity.

Idea behind a business, central to the generation of revenue.

plural of idea dinner