The most common meaning nowadays of the Holocaust (with an article and a capital h) is the Nazi genocide of the Jews. Sometimes other victims who were murdered by the Nazis on the basis of their group identity are included, in particular, the gypsies (Roma). Around 1980 it replaced the term 'Final Solution [of the Jewish Question]', which was the Nazis' own term. Before the late 1970s the word was most commonly used (without a capital H) in the expression
nuclear holocaust, which referred to the feared nuclear war between East and West.
The word Holocaust means great destruction resulting in the extensive loss of life by fire.
It comes from the Greek word "holokaustos", which means "burned whole". It has been used in English for a long time in the sense of disaster involving many deaths (especially by fire). In its Middle English form, derived from Greek, it was used to mean a burnt offering. This later broadened to any major destruction due to fire, and broadened further to mean any mass destruction. When used in capitalized form, it is specifically referring to the mass destruction of Jewish and other people by the Nazis in World War Two.
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It comes from a Greek word which means a sacrifice totally burned by fire. It has been widely used in English in the sense of 'great destruction (usually by fire)'. For example, in the 1950s and 1960s there was widespread fear of a
nuclear holocaust.
Since the late 1970s the word
holocaust has been widely used in historical writing in the sense of
genocide.
The Holocaust (without any further detail or qualification) refers to the genocide of about 6 million Jews by the Nazis. The Ottoman Turkish murder of about 1.5 million Armenians in 1915-1917 is often also referred to the
Armenian Holocaust).
The term is often extended to the systematic, mass killing of all groups that the Nazis tried to exterminate on the basis of group membership - including Roma (Gypsies), homosexuals, Jehovah's Witnesses, incuarbles, Soviet political commissars and some other groups. Recently, the word has been widely used in English for the Nazi genocide of the Jews and has largely replaced the expression
Final Solution [of the Jewish question], which is a direct translation of Nazis' own term.
Some people are uneasy about the use of the word holocaust because it can have religious implications. In Hebrew the word
Shoah, meaning
great calamity, is widely used instead.
For practical and linguistic purposes the meaning of a word is its current use, not its etymology or history.Parts of the answers to the Related Questions below and the links give definitions and some discussion.