The meaning of MONUMENTAL is serving as or resembling a monument : massive; also : highly significant : outstanding. How to use monumental in a sentence.

MONUMENTAL definition: resembling a monument; massive or imposing. See examples of monumental used in a sentence.

In such a monumental undertaking it is inevitable that errors and inaccuracies occur.

Definition of monumental adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

If you describe a book or musical work as monumental, you are emphasizing that it is very large and impressive, and is likely to be important for a long time.

1. Of, resembling, or serving as a monument. 2. Impressively large, sturdy, and enduring. 3. Of outstanding significance: Einstein's monumental contributions to physics. 4. Astounding: monumental …

WordReference Random House Learner's Dictionary of American English © 2026 mon•u•men•tal /ˌmɑnyəˈmɛntəl/ adj. of or relating to a monument. exceptionally great, as in quality or degree: a …

Serving as a monument or as material for a monument; memorial; preserving memory: as, a monumental pillar. Having the character of a monument; resembling a monument.

Monumental refers to something that is very large, impressive, or significant, either in size, impact or historical importance. It often relates to buildings, structures, achievements, or events that are grand, …

Whether it's a monumental effort requiring vast amounts of strength or a monumental cruise ship with eleven floors and five sets of elevators, the word monumental describes something imposing or …