To ideate is to form an idea or conception of something.

// Jocelyn used the education seminar's lunch hour to talk with other teachers and ideate new activities to use in the classroom.

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“Well, luckily, at the same time that I was working within these industry spaces, I was also building ARRAY. It’s over a decade old, it is a distribution company, we distribute films by women and filmmakers of color, we have public programming for free, for the community, all around cinema. We have a four-building campus in Echo Park where we edit and we ideate and we educate and we do all kinds of beautiful things.” — Ava DuVernay, Talk Easy with Sam Fragoso [podcast], 14 Jan. 2024

Like idea and ideal, ideate comes from the Greek verb idein, which means “to see.” The sight-thought connection came courtesy of Plato, the Greek philosopher who based his theory of the ideal on the concept of seeing, claiming that a true philosopher can see the essential nature of things and can recognize their ideal form or state. Early uses of idea, ideal, and ideate in English were associated with Platonic philosophy; idea meant “an archetype” or “a standard of perfection,” ideal meant “existing as an archetype,” and ideate referred to forming Platonic ideas. But though ideate is tied to ancient philosophy, the word itself is a modern concoction, relatively speaking. It first appeared in English only about 400 years ago.