selfsame
self·same
selfsame · selfsames
Chiefly preceded by the: precisely the same person or thingChiefly preceded by the: precisely the same person or thing.
UK/ˈsɛlfseɪm/US/ˈsɛlfˌseɪm/
Meaning
1 senses(archaic)Chiefly preceded by the: precisely the same person or thing.