Definitions:
a small circular band, typically of precious metal and often set with one or more gemstones, worn on a finger as an ornament or a token of marriage, engagement, or authority

a ring-shaped or circular object

an enclosed space, surrounded by seating for spectators, in which a sport, performance, or show takes place

a group of people engaged in a shared enterprise, especially one involving illegal or unscrupulous activity

a number of atoms bonded together to form a closed loop in a molecule

a set of elements with two binary operations, addition and multiplication, the second being distributive over the first and associative.

surround (someone or something), especially for protection or containment

put an aluminium strip round the leg of (a bird) for subsequent identification

fraudulently change the identity of (a motor vehicle), typically by changing its registration plate

make a cl