Main Entry:: sym·me·try
Pronunciation:: \ˈsi-mə-trē\
Function:: noun
Inflected Form(s):: plural sym·me·tries
Etymology:: Latin symmetria, from Greek, from symmetros symmetrical, from syn- + metron measure — more at measure
Date:: 1563

1: balanced proportions ; also : beauty of form arising from balanced proportions2: the property of being symmetrical ; especially : correspondence in size, shape, and relative position of parts on opposite sides of a dividing line or median plane or about a center or axis — compare bilateral symmetry , radial symmetry3: a rigid motion of a geometric figure that determines a one-to-one mapping onto itself4: the property of remaining invariant under certain changes (as of orientation in space, of the sign of the electric charge, of parity, or of the direction of time flow) —used of physical phenomena and of equations describing them

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