say it: vej-uh-TAY-shuhn
vegetation is a noun meaning "all the plant life in a particular region or period". It carries 4 recorded senses.
plant
the process of growth in plants
an abnormal growth or excrescence (especially a warty excrescence on the valves of the heart)
inactivity that is passive and monotonous, comparable to the inactivity of plant life
“their holiday was spent in sleep and vegetation”
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 vegetation 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.