Pronunciation (UK) IPA (key): /vəˈl(j)uː.mɪ.nəs/ (US) IPA (key): /vəˈlu.mə.nəs/ Audio (UK)(file) Adjective Positive voluminous Comparative more voluminous Superlative most voluminous If something is voluminous, it pertains to volume. If something is voluminous, it has great volume. Synonyms: bulk and largeWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads