Etymology
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monumental (adj.)

c. 1600, "pertaining to a monument," from Late Latin monumentalis "pertaining to a monument," from monumentum (see monument). From 1650s in the loose sense of "conspicuous, vast, stupendous, comparable to a monument." Extended sense of "historically prominent, conspicuous to posterity" is by 1844. Related: Monumentally.

updated on February 17, 2019

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Definitions of monumental from WordNet

monumental (adj.)
relating or belonging to or serving as a monument;
monumental sculptures
the use of the arch in monumental architecture
monumental (adj.)
of outstanding significance;
Einstein's monumental contributions to physics
monumental (adj.)
imposing in size or bulk or solidity;
a monumental scale
Synonyms: massive / monolithic
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.