Required
Required adjective - Forcing one's compliance or participation by or as if by law.
Textbook and required are semantically related. In some cases you can use "Textbook" instead an adjective "Required".
Nearby Words: requirement, requiring
Textbook
Textbook adjective - Constituting, serving as, or worthy of being a pattern to be imitated.
Mutual synonyms
Both words in one sentence
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Every teacher in the state was required to teach from the same biology textbook — Civic Biology — and thus every teacher in Dayton was violating the law.
Source: Theatre / Inherit the Wind - From the textbook Introduction To Professional Engineering In Canada: Third Edition: "A major engineering project, the survey lasted seven years and required specially designed instruments, perseverance in the face of accident, revolution, and war, and written reports."
Cite this Source
Textbook and Required. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/required/textbook
Required & Textbook. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/required/textbook>.
Textbook or Required. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/required/textbook.
Google Ngram Viewer shows how "required" and "textbook" have occurred on timeline