perhaps abstracted from O.E.
swa same "the same as," but more likely from O.N.
same, samr "same," both from P.Gmc.
*samon (cf. O.S., O.H.G., Goth.
sama; O.H.G.
samant, Ger.
samt "together, with," Goth.
samana "together," Du.
zamelen "to collect," Ger.
zusammen "together"), from PIE
*samos "same," from base
*sem- "one, together" (cf. Skt.
samah "even, level, similar, identical;" Avestan
hama "similar, the same;" Gk.
hama "together with, at the same time,"
homos "one and the same,"
homios "like, resembling,"
homalos "even;" L.
similis "like;" O.Ir.
samail "likeness;" O.C.S.
samu "himself"). O.E. had lost the pure form of the word; the modern word replaced synonymous
ilk (q.v.). Colloq. phrase
same here as an exclamation of agreement is from 1895.
Same difference curious way to say "equal," is attested from 1945.