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Reason

/ˈriːz(ə)n/

The explanation, justification, or cause for something occurring or being done.

Synonyms:

Everyone who is here, is here for their own reasons.

They could not, as both reasoned between them.

Now she had a new reason to dislike her.

From Old French raison, derived from Latin rationem, which means a calculation, account, or cause.

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