A perfectly round, flat shape where every point on the edge is the same distance from the center. It can also mean a group of people connected by friendship or interest.
From Old French "cercle," from Latin "circulus" meaning "ring" or "circle," a diminutive of "circus" meaning "ring" or "circular line." The idea of a ring shape spread into many uses, from geometry to groups of people.
Circles show up everywhere—planets, eyes, wheels—because nature and physics love this shape. The word also jumped from geometry into social life, so your "circle of friends" is literally the ring of people closest to you.
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