ring

noun

1. A solid object in the shape of a circle. A circumscribing object, (roughly) circular and hollow, looking like an annual ring, earring, finger ring etc.

   “His brother gifted him a ring for the engagement.”

2. A circumscribing object, (roughly) circular and hollow, looking like an annual ring, earring, finger ring etc.

verb

1. To enclose or surround.

   “The inner city was ringed with dingy industrial areas.”

2. To make an incision around; to girdle; to cut away a circular tract of bark from a tree in order to kill it.

   “They ringed the trees to make the clearing easier next year.”

3. To attach a ring to, especially for identification.

   “We managed to ring 22 birds this morning.”

4. To surround or fit with a ring, or as if with a ring.

   “to ring a pig’s snout”

noun

1. The resonant sound of a bell, or a sound resembling it.

   “The church bell's ring could be heard the length of the valley.”

2. A pleasant or correct sound.

   “The name has a nice ring to it.”

3. A sound or appearance that is characteristic of something.

   “Her statements in court had a ring of falsehood.”

4. A telephone call.

   “I’ll give you a ring when the plane lands.”

verb

1. Of a bell, etc., to produce a resonant sound.

   “The bells were ringing in the town.”

2. To make (a bell, etc.) produce a resonant sound.

   “The deliveryman rang the doorbell to drop off a parcel.”

3. To produce (a sound) by ringing.

   “They rang a Christmas carol on their handbells.”

4. To produce the sound of a bell or a similar sound.

   “Whose mobile phone is ringing?”

noun

1. An algebraic structure which consists of a set with two binary operations: an additive operation and a multiplicative operation, such that the set is an abelian group under the additive operation, a monoid under the multiplicative operation, and such that the multiplicative operation is distributive with respect to the additive operation.

   “The set of integers, ℤ, is the prototypical ring.”

2. An algebraic structure as above, but only required to be a semigroup under the multiplicative operation, that is, there need not be a multiplicative identity element.

   “The definition of ring without unity allows, for instance, the set 2ℤ of even integers to be a ring.”