identical

exactly alike; incapable of being perceived as different

• “rows of identical houses”
• “cars identical except for their license plates”
• “they wore indistinguishable hats”

being the exact same one; not any other:

• “this is the identical room we stayed in before”
• “the themes of his stories are one and the same”
• “saw the selfsame quotation in two newspapers”
• “on this very spot”
• “the very thing he said yesterday”
• “the very man I want to see”

(of twins) derived from a single egg or ovum

• “identical twins are monovular”

having properties with uniform values along all axes

coinciding exactly when superimposed

• “identical triangles”