English definition of “idea”
SUGGESTION [C] › a suggestion or plan: "Why don't we ask George?" "That's a good idea." [+ for + doing sth] Stevens explained his ideas for improving production. [+ to do sth] It was Kate's idea to hire a car.
THOUGHT [U, no plural] › an understanding, thought, or picture in your mind: [+ of + doing sth] Clive soon got used to the idea of having children around the house again. [+ (that)] I don't want them to get the idea that we're not interested.
have no idea › to not know: Beth had no idea where he'd gone.
OPINION [C] › an opinion or belief: My husband and I have very different ideas about school discipline.