All 6 Uses

illustrate
in
A Gentleman in Moscow
(Edited)

By way of illustration, Nina pointed her pencil to the first column of her grid, in which six objects were listed in ascending order of size.
p. 152.1

illustration = something that helps make clear
Sofia's interest piqued, the Count launched into a description of the species, animating each of its characteristics with an illustrative flourish of the arms.
p. 239.4

illustrative = serving to help make clear
"Do you enjoy pictures?" he asked, picking up an illustrated guide to the Louvre that he had borrowed from the basement.
p. 240.1 *

illustrated = accompanied by pictures or drawings
As if to illustrate, the Count gestured generously and judiciously toward the hotel's entrance, while giving an exemplary sigh.
p. 322.9

illustrate = help make clear
That is, until they learned that to better illustrate the function of his machines, Webster had asked his father to send him fifty cases of American cigarettes and chocolate bars.
p. 397.2
For some time, he said, he had been experiencing a tremor of the hands consistent with the onset of palsy. ... By way of illustration, he held his right hand over the table where it trembled like a leaf.
p. 408.4 *

illustration = something that helps demonstrate

Definitions:

(1) (illustrate as in: as illustrated by this example)
to help make clear -- typically by example
(2) (illustrate as in: an illustrated children's book)
to draw pictures (or provide photographs) to accompany a book or other writing
(3) (meaning too rare to warrant focus)