vinificationPronunciation: /ˌvɪnɪfɪˈkeɪʃ(ə)n/Definition of vinification noun [mass noun] the conversion of grape juice or other vegetable extract into wine by fermentation. Derivatives vinifyPronunciation: /ˈvɪnɪfʌɪ/ verb (vinifies, vinifying, vinified)vinification in other Oxford dictionaries Definition of vinification in the US English dictionary