1 put pictures in sth
ADV. heavily, lavishly, richly | fully | attractively, beautifully, delightfully, handsomely, superbly
PREP. with The new edition is heavily illustrated with photographs of aircraft.
2 make sth clear using examples/pictures
ADV. amply | admirably, aptly, neatly, nicely, well The dire consequences of chronic underfunding are nowhere better illustrated than in the nation's schools. | perfectly | merely, simply His question merely illustrates his ignorance of the subject. | clearly, dramatically, graphically, strikingly, vividly | brutally, starkly, tragically The case tragically illustrates the dangers of fireworks.
VERB + ILLUSTRATE serve to Two examples serve to illustrate this point. | be chosen to, be designed to, be intended to
PREP. to a way of illustrating to the chairman the folly of his decision