being the exact same one; not any other:
exactly alike; incapable of being perceived as different
coinciding exactly when superimposed
(of twins) derived from a single egg or ovum
having properties with uniform values along all axes
the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen
being essentially equal to something
a person or thing equal to another in value or measure or force or effect or significance etc
