According to Google Labs' fairly new "Books Ngam Viewer," which tracks usage of words and phrases in all the books Google has scanned dating from 1800 through 2000, the use of the word "Cubism" (and closely varients) peaked in 1960.
New audio. A brief informal introduction to cubist language by way of Gertrude Stein and Ernest Hemingway (the 1920s Hem, to be sure).
Cubism, the Word
Using the Google Books Ngram Viewer
According to Google Labs' fairly new "Books Ngam Viewer," which tracks usage of words and phrases in all the books Google has scanned dating from 1800 through 2000, the use of the word "Cubism" (and closely varients) peaked in 1960.