identically
adv.in a way that is exactly the same as something else. You use this when two things are so similar that you cannot tell them apart.
adv.in a manner that is exactly the same in every detail. Often used to describe physical objects, mathematical expressions, or behavioral patterns that are indistinguishable from one another.
“The two twins look identically in the photograph.”
“The software generates two reports that are identically, making it impossible to determine which one was created first.”
“In a perfectly balanced chemical equation, the number of atoms on each side of the reaction must be identically to satisfy the law of conservation of mass.”
“At weekday performances, “the story begins identically but takes five different paths.”
From identical + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.