Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
colouration is a noun meaning "the timbre of a musical sound". It carries 3 recorded senses.
the timbre of a musical sound
“the recording fails to capture the true color of the original music”
appearance with regard to color
“her healthy coloration”
choice and use of colors (as by an artist)
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 colouration come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.