Another word for "Happening Quickly" is "Speedily"!
half a decade
10 years is a decade
There is no single word to describe 5 years. You could call it half a decade I suppose.
Computers: Software, application The world: Event, activity
happenAlso occur or two words ...will be
Some synonyms for the noun event are:gatheringfunctionhappeningaffaircelebrationceremonyoccasionoccurrence
the main event - the most important thing happening
chance
happening, appearance, event, aspect, miracle
Once every century?
The single word is happening, an event or occurrence.This is also the progressive/continuous form of to happen. (e.g. what was happening?)
The word occurrence is defined as an event, incident or frequency of an event occurring. Some synonyms of the word occurrence include event, incident, happening, occasion and case.
A 10 year anniversary is called a decennial.
the word that you are looking for is genicide(s), the Holocaust was a singular event, not the description of a type of event.
Event and episode are synonyms for happening.
It is called: observation.