inoculation n. + Add to list US //ˌɪˌnɑkjəˈɫeɪʃən// UK //ɪnˌɒkjʊlˈeɪʃən// in·oc·u·la·tion SynonymsEtymology Synonyms vaccinationOrigin From Latin inoculātio. Equivalent to inoculate + -ion.