Instance is defined as an occurrence of something, or a specific situation, happening or event.(noun)
An example of instance is a specific situation in which bad judgment is expressed; it is an instance of bad judgment.
See instance in Webster's New World College Dictionary
Origin: ME instaunce < OFr instance < L instantia, a standing upon or near, being present < instans: see instant
See instance in American Heritage Dictionary 4
Origin: Middle English instaunce
Origin: , from Old French instance, request, instant
Origin: , and from Medieval Latin īnstantia, example
Origin: , both from Latin, presence
Origin: , from īnstāns, īnstant-, present; see instant.
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