noun, feminine

insonorisation

/ɛ̃.sɔ.nɔ.ʁi.za.sjɔ̃/

noun, feminine/ɛ̃.sɔ.nɔ.ʁi.za.sjɔ̃/plural: insonorisations

insonorisation is feminine in French.

soundproofing

From insonore + -isation.