1. identical, indistinguishable

exactly alike; incapable of being perceived as different

Example Sentences:
'rows of identical houses'
'cars identical except for their license plates'
'they wore indistinguishable hats'

• indistinguishable

2. identical, selfsame, very

being the exact same one; not any other:

Example Sentences:
'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'

• selfsame
• very

3. identical, monovular

(of twins) derived from a single egg or ovum

Example Sentences:
'identical twins are monovular'

• monovular

4. identical

having properties with uniform values along all axes

• isotropic
• isotropous

5. identical, superposable

coinciding exactly when superimposed

Example Sentences:
'identical triangles'

• superposable