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Avicenna (980–1037)

In early Islamic philosophy, Avicenna (Ibn Sina) defined truth in his work Kitab Al-Shifa The Book of Healing, Book I, Chapter 8, as:

What corresponds in the mind to what is outside it.

Avicenna elaborated on his definition of truth later in Book VIII, Chapter 6:

The truth of a thing is the property of the being of each thing which has been established in it.

This definition is but a rendering of the medieval Latin translation of the work by Simone van Riet. A modern translation of the original Arabic text states:

Truth is also said of the veridical belief in the existence.