say it: il-uh-STRAY-shuhn
illustration is a noun meaning "artwork that helps make something clear or attractive". It carries 4 recorded senses.
showing by example
an item of information that is typical of a class or group
“this patient provides a typical example of the syndrome”
“there is an example on page 10”
a visual representation (a picture or diagram) that is used make some subject more pleasing or easier to understand
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for illustration come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.