So, on what finger do you wear a promise ring? In the USA and the UK, the ring finger (fourth finger) of the left hand holds the greatest significance; engagement rings and wedding rings are worn on this finger almost without exception.
In biology and ecology, extinction is the end of an organism or of a group of organisms (taxon), normally a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively.
By Richard Nordquist. Definition. A linguistic term for the end or extinction of a language. Also called language extinction. Distinctions are commonly drawn between an endangered language (one with few or no children learning the language) and an extinct language (one in which the last native speaker has died). See Examples and Observations below.