How do we spell required?

Correct spelling for the English word “required” is [ɹɪkwˈa͡ɪ͡əd], [ɹɪkwˈa‍ɪ‍əd], [ɹ_ɪ_k_w_ˈaɪə_d] (IPA phonetic alphabet).

What is an example of the word required?

Require is defined as to need or demand. An example of to require is someone needing sleep when they are very tired. To impose an obligation on; compel. The school requires all students to study mathematics.