the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun; "a Martian year takes 687 of our days"
a period of time containing 365 (or 366) days; "she is 4 years old"; "in the year 1920"
a period of time occupying a regular part of a calendar year that is used for some particular activity; "a school year"
the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle; "nerve impulses cross a synapse through the action of neurotransmitters"
a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain; a long tubelike structure extending from the base of the brain through the vertebral canal to the upper lumbar region
jewelry consisting of a circlet of precious metal (often set with jewels) worn on the finger; "she had rings on every finger"; "he noted that she wore a wedding band"
a square platform marked off by ropes in which contestants box or wrestle
a characteristic sound; "it has the ring of sincerity"
the sound of a bell ringing; "the distinctive ring of the church bell"; "the ringing of the telephone"; "the tintinnabulation that so voluminously swells from the ringing and the dinging of the bells"--E. A. Poe
a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
attach a ring to the foot of, in order to identify; "ring birds"; "band the geese to observe their migratory patterns"
sound loudly and sonorously; "the bells rang"
make (bells) ring, often for the purposes of musical edification; "Ring the bells"; "My uncle rings every Sunday at the local church"
the size of something as given by the distance around it
the length of the closed curve of a circle
the boundary line encompassing an area or object; "he had walked the full circumference of his land"; "a danger to all races over the whole circumference of the globe"