All I could think of was the meaning "one hundred."
I finally read today that in LATIN, the word cento means PATCHWORK!
The verse form is MEANT to resemble "a quilt of discrete lines stitched together to make a whole."
The ancient Greeks assembled centos in homage to Homer, the Romans in homage to Virgil.
From "Introduction" by David Lehman in the book THE CENTO: A COLLECTION OF COLLAGE POEMS:
"Ever since T.S. Eliot raided Elizabethan drama and 17th-century poetry for "The
Waste Land," the collage has held a strong attraction for modern poets. The cento
as contemporary poets practice it is a specialized form of the collage: an anthology
poem from diverse sources. I still remember John Ashbery did one called 'To a
Waterfowl" in 1961 . . . I still remember one couplet by heart:
"Calm was the day and through the trembling air,
coffee and oranges in a sunny chair."
The first line is by Edmund Spenser, the second by Wallace Stevens, and the combined
effect is the magic of Ashbery."