Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
alluvion is a noun meaning "gradual formation of new land, by recession of the sea or deposit of sediment". It carries 3 recorded senses.
gradual formation of new land, by recession of the sea or deposit of sediment
the rising of a body of water and its overflowing onto normally dry land
“plains fertilized by annual inundations”
clay or silt or gravel carried by rushing streams and deposited where the stream slows down
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 alluvion come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.