1.Definition: (of twins) derived from a single egg or ovum

"Identical twins are monovular"

Related Adjective(s):monovular

2.Definition: being the exact same one; not any other:

"This is the identical room we stayed in before"

Related Adjective(s):selfsame, very

3.Definition: coinciding exactly when superimposed

"Identical triangles"

Related Adjective(s):superposable

4.Definition: exactly alike; incapable of being perceived as different

"Rows of identical houses", "Cars identical except for their license plates"

Related Adjective(s):indistinguishable

5.Definition: having properties with uniform values along all axes