noun pl. symmetries -·tries

1. similarity of form or arrangement on either side of a dividing line or plane; correspondence of opposite parts in size, shape, and position; condition of being symmetrical: the whole or the corresponding parts are said to have symmetry
2. balance or beauty of form or proportion resulting from such correspondence

Etymology: < MFr or L: MFr symmetrie (now symétrie) < L symmetria < Gr < symmetros, measured together < syn-, together + metron, a measure