world leader

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Also see: leader

Concise Oxford English Dictionary © 2008 Oxford University Press:
world/wɜːld/

▶noun

• 1 (the world) the earth with all its countries and peoples.

  ■ all of the people on the earth.

  ■ (one's world) one's life and activities.

• 2 a region or group of countries: the English-speaking world.

  ■ all that belongs to a particular historical period or sphere of activity: the world of British theatre.

• 3 (the world) human and social interaction.

  ■ secular or material matters as opposed to spiritual ones.

  ■ a stage of human life, either mortal or after death.

• 4 another planet like the earth.

– phrases
the best of both (or all possible) worlds the benefits of widely differing situations, enjoyed at the same time.
—— in the world used to express astonishment or disbelief in questions: What in the word are they doing?
man (or woman) of the world a person who is experienced in the ways of sophisticated society.
not do something for the world not do something whatever the inducement.
out of this world informal extremely enjoyable or impressive.
think the world of have a very high regard for.
the world and his wife Brit. informal everybody.
the world, the flesh, and the devil all forms of temptation to sin.
a (or the) world of a very great deal of.

– origin OE w(e)oruld, from a Gmc compound meaning ‘age of man’.