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In English, world is rooted in a compound of the obsolete words were, man, and eld, age; thus, its oldest meaning is "age or life of man". Its primary modern meaning is the planet Earth, especially when capitalized: the World. In this sense, a world map is a map of the surface of the Earth. World can also refer to human population in general or to a distinct group of people.
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In other contexts, "world" is sometimes used poetically to mean any planet or moon; for example, Mars and Titan are two 'worlds' within the solar system.
"World" is sometimes used to refer to the entire Universe. This is less common now that knowledge of space is commonplace; however, it is still used vaguely in this sense (as in "the whole wide world"). A similar sense is also used in philosophy, particularly in discussion of "possible worlds"; a possible world is any possible complete history of the whole universe.
World can be used in less literal words; for example, two people with very little in common are "living in two different worlds". The "end of the world" usually means "the end of everything I am familiar with."
The terms First World, Second World, and Third World were used to divide the nations of Earth into three broad categories. The three terms did not arise simultaneously. After World War II it became common to speak of the capitalist and Communist countries as two major blocs, scarcely using such terms as the "free world" as compared to the "communist bloc". The two "worlds" were not numbered. It was eventually pointed out that there were a great many countries that fit into neither category, and in the 1950s this latter group came to be called the Third World. It then began to seem that there ought to be a "First World" and a "Second World". These latter terms were always much less common.
In the context of the Cold War:
There were a number of countries which did not fit comfortably into this neat definition of partition, including Switzerland, Sweden, and the Republic of Ireland, which chose to be neutral. Finland was under the Soviet Union's sphere of influence but was not communist, nor was it a member of the Warsaw Pact. Austria was under the United States' sphere of influence, but in 1955, when the country again became a fully independent republic, it did so under the condition that it remained neutral.
With the 1991 collapse of the Soviet Union, the term "Second World" largely fell out of use, though the term "Third World" remains popular, mostly as another term for developing countries. The remaining Communist countries either became more isolated from the world economy, as in North Korea and Cuba, or began integrating capitalist concepts such as private enterprise into their societies and forging new trading ties with external capitalist economies, as in Vietnam and China.
In more recent use, the term First World refers to developed nations, while Third World, in contrast, refers to developing/undeveloped nations.
There is also the less commonly used term Fourth World, often used to refer to nations that lack any national representation at the UN, but that may enjoy representation at UNPO — indigenous peoples living within or across state boundaries.
"The World" can also be used to refer to the group of people on the planet earth.