WHO Definition

WHO
abbreviation

1. World Health Organization.

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who
pronoun

1. Used in questions, indirect questions and statements: which or what person; which or what people.

Example: Who is at the door?
Example: asked who else he had seen
2. Used as a relative pronoun to introduce a defining clause.

Example: the boy who was on the train
3. Used as a relative pronoun to add a commenting clausebc

Example: Julius Caesar, who was murdered in 44

Idiom: know who's who

To know the important people and what they do.

Etymology: Anglo-Saxon hwa.