Meaning of “symmetry” in the English Dictionary

"symmetry" in British English

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symmetrynoun [ U ]

uk /ˈsɪm.ə.tri/ us /ˈsɪm.ə.tri/

the quality of having parts that match each other, especially in a way that is attractive, or similarity of shape or contents:

The design of the house had a pleasing symmetry, its oblong shape being picked up in its elongated windows.

specialized mathematics in mathematics, the quality of having two parts that match exactly, either when one half is like an image of the other half in a mirror, or when one part can take the place of another if it is turned 90° or 180°

symmetrical
adjective uk /sɪˈmet.rɪ.kəl/ us /sɪˈmet.rɪ.kəl/ also symmetric,
symmetrically
adverb uk /sɪˈmet.rɪ.kəl.i/ us /sɪˈmet.rɪ.kəl.i/

(Definition of “symmetry” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"symmetry" in American English

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symmetrynoun [ U ]

us /ˈsɪm·ɪ·tri/

geometry the quality of having parts on either side or half that match each other, esp. in an attractive way, or are the same size or shape

symmetrical
adjective us /səˈme·trɪ·kəl/

geometry

Many types of triangles are symmetrical.

(Definition of “symmetry” from the Cambridge Academic Content Dictionary © Cambridge University Press)