idēˈaed or idēˈa'd adjective

Provided with an idea or ideas

idēˈaless adjective

Devoid of ideas

idēˈate transitive verb

1. To form or have an idea of
2. To imagine
3. To preconceive

To form ideas

Produced by an idea

The correlative or object of an idea

idēāˈtion noun

1. The power of the mind for forming ideas or images
2. The exercise of such power

idēāˈtional or idēˈative adjective

idēāˈtionally adverb

get or have ideas (informal)

1. To become or be overambitious
2. To have undesirable ideas

have no idea

1. To be unaware of what is happening
2. To be ignorant or naive

not my idea of (informal)

The opposite of my (or the accepted and familiar) conception of

put ideas into someone's head

To fill someone with unsuitable or over-exalted aspirations

that's an idea

That plan, suggestion, etc is worth considering

that's the idea

You have understood the point

the very idea

1. The mere thought
2. (as an ejaculation) that's absurd, outrageous

what an idea!

That's preposterous

what's the big idea? (slang, usu ironic)

What's the intention, purpose?