If you fold something in half it will line up evenly
The word symmetrical is used as an adjective and you can use the word for a kind of object that is designed in such a way that the two halves of it are of the same size and shape. The shapes of an egg when cut into two halves in the longitudinal way have both the sides equal and so you can use the word for an egg. This is one of the most common word that we hear in our day-to-day conversation and you will find that there are many objects that we use in our daily life are in the symmetrical pattern. The adverb that you can use for the word is symmetrically and the antonymous term that is used for the term is asymmetric.
A shape that if you put a line of symmetry on the shape, both sides are the same