Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 adj. Symmetrical.
 adj. Of a relation R on a set S, such that xRy if and only if yRx for all members x and y of S (that is, if the relation holds between any element and a second, it also holds between the second and the first).
 adj. Using the same key (or keys that are trivially related) for both encryption and decryption.
from the GNU version of the Collaborative International Dictionary of English
 adj. Symmetrical.
from The Century Dictionary and Cyclopedia
 Same as symmetrical.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adj. having similarity in size, shape, and relative position of corresponding parts
Etymologies
Examples

It's the belief in symmetric fluctuations that drives the focus on policy rules rather than policy events.
Keynesians and Monetarists, Arnold Kling  EconLog  Library of Economics and Liberty

It shows how we human beings see the objects around us in symmetric shapes.

This phenomenon, of nature being nonmirror symmetric, is known as CP violation, and rocked the physics world when it was discovered experimentally in the 60’s.
A NonTechnical Explanation of Flavo(u)r Physics « Imaginary Potential

One contained a description of the solutions that I argued, from an economic standpoint, represented dynamic equilibrium outcomes in symmetric noncooperative games and in dominantplayer games (International Economic

First, Delta One has what mathematicians call a symmetric payoff profile.

If such a group is given and held fast, then a figure in space is called symmetric if each automorphism of the group leaves it unchanged.

Our WAN op positions, what's known as symmetric performance, we have a box at either end of the network, and we get this incredible speedups.

The two leading types of encryption are private key (also called symmetric key) cryptography and public key cryptography.

Aren't you reading "symmetric" into what Brad wrote?
Keynesians and Monetarists, Arnold Kling  EconLog  Library of Economics and Liberty

I like how this turned out, with the lights and the way they are kind of symmetric and framed by all the gear.
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