An identical twin.
Something which has exactly the same properties as something else.
Not different or other; not another or others; not different as regards self; selfsame; numerically identical.
Bearing full likeness by having precisely the same set of characteristics; indistinguishable.
Of twins, sharing the same genetic code.
Approximating or approaching exact equivalence.
Exactly equivalent.
For more quotations using this term, see Citations:identical.
A twin other than an identical twin.
Not identical; different in some respect.