tˈɛknɪkli, ɪɾ ɪz sˈɛntɹəlˌaɪzd kəntˈeɪnmənt ænd ˌaɪsəlˈeɪʃən ʌv jˈuːzd nˈuːklɪɹ fjˈuːəl ɪn ɐ dˈiːp dʒˌɪəlˈɑːdʒɪkəl ɹᵻpˈɑːzɪtˌoːɹi.
Technically, it is centralized containment and isolation of used nuclear fuel in a deep geological repository.