Definitions of identical:

• adjective:   having properties with uniform values along all axes
• adjective:   exactly alike; incapable of being perceived as different

  Example: "Rows of identical houses"

• adjective:   being the exact same one; not any other:

  Example: "This is the identical room we stayed in before"

• adjective:   (of twins) derived from a single egg or ovum

  Example: "Identical twins are monovular"

• adjective:   coinciding exactly when superimposed

  Example: "Identical triangles"