symmetrical
adj.having two halves that are exactly the same in shape and size. You use this to describe things that look balanced and even on both sides.
adj.having parts that correspond to one another in size, shape, and position. Often used to describe geometric figures, biological structures, or aesthetic compositions.
“The butterfly has beautiful symmetrical wings.”
“The architect designed a symmetrical facade for the museum, with identical columns on either side of the main entrance.”
“In classical portraiture, a perfectly symmetrical face is often used to represent ideal beauty, though slight natural imbalances can often make a subject appear more approachable and human.”
Typically used attributively before a noun or predicatively after a linking verb like 'be' or 'look'.
While common in casual speech, 'symmetrical' is often treated as a non-gradable adjective in technical contexts; something is either symmetrical or it is not.
“Among the study's limitations, the authors note that the two features they studied were not perfectly symmetrical and therefore may not generalize to other expert or peer designs.”
From symmetry + -ical.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.