Etymology
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selfsame (adj.)

also self-same, "identical, the very same," early 15c., from self + same. Written as two words until c. 1600. As a noun, "selfsame person or thing," early 15c., now obsolete. Related: Selfsameness.

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Definitions of selfsame

selfsame (adj.)
being the exact same one; not any other:;
saw the selfsame quotation in two newspapers
Synonyms: identical / very
From wordnet.princeton.edu