in aeternum

in ae·ter·num

I0072500 (ē-tûr′nəm)adv. To eternity; forever.
[Latin : in, in, for + aeternum, all the time to come, from neuter accusative of aeternus, eternal.]

in aeternum

(ɪn iːˈtɜːnəm) adv (Literary & Literary Critical Terms) forever; eternally

in ae•ter•num

(ɪn aɪˈtɛr nʊm; Eng. ɪn iˈtɜr nəm)

adv. Latin. forever.