olemus
sarja element kontekstist sõltuvas tähenduses

Wiktionary:
5. occasion; order of occurrence
6. a case offered as an exemplification or a precedent; an illustrative example
7. one of a series of recurring occasions, cases, essentially the same
8. (computing) a specific occurrence of something that is created or instantiated, such as a database, or an object of a class in object-oriented programming.

ISO/IEC 33001, process instance:
protsessi konkreetne identifitseeritav täitmisjuhtum
= single specific and identifiable execution of a process

näiteid
https://www.wikidata.org/wiki/Property:P31

https://en.wikipedia.org/wiki/Instance_(computer_science)

https://en.wikipedia.org/wiki/Instantiation

in all instances -- kõigil neil juhtudel
in that instance -- sel juhul
isolated instance -- üksikjuhtum
parallel instance -- analoogne juhtum
particular instance -- üksikjuhtum
single instance -- üksikjuhtum
solitary instance -- üksikjuhtum