UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/eɪˈsɪmətri/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/eɪˈsɪmɪtri/ ,USA pronunciation: respelling(ā simi trē)

WordReference Random House Unabridged Dictionary of American English © 2020
a•sym•me•try  (ā simi trē),USA pronunciation n. 
  1. the quality or state of being asymmetric.
  • Greek asymmetría lack of proportion. See a-6, symmetry
  • 1645–55

Collins Concise English Dictionary © HarperCollins Publishers::
asymmetry /æˈsɪmɪtrɪ eɪ-/ n
  1. lack or absence of symmetry in spatial arrangements or in mathematical or logical relations
WordReference Random House Learner's Dictionary of American English © 2020
a•sym•met•ric /ˌeɪsəˈmɛtrɪk/USA pronunciation  also ˌa•symˈmet•ri•cal, adj. 
  1. having two sides or halves that are differently shaped:an asymmetrical pattern.
a•sym•me•try /eɪˈsɪmɪtri/USA pronunciation  n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2020
a•sym•met•ric  (ā′sə metrik, as′ə-),USA pronunciation adj. 
  1. not identical on both sides of a central line;
    lacking symmetry:Most faces are asymmetric.
  2. Mathematics(of a logical or mathematical relation) holding true of members of a class in one order but not in the opposite order, as in the relation "being an ancestor of.''
  3. Chemistry
    • having an unsymmetrical arrangement of atoms in a molecule.
    • noting a carbon atom bonded to four different atoms or groups.
    • (of a polymer) noting an atom or group that is within a polymer chain and is bonded to two different atoms or groups that are external to the chain.
Also,  a′sym•metri•cal.  a′sym•metri•cal•ly, adv. 
  • a-6 + symmetric 1870–75

'asymmetry' also found in these entries (note: many are not synonyms or translations):
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