Understood to be in Latin (5)

I believe the answer is:

tacit

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'understood' is the definition.
(I know that understood can be written as tacit)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tacit that I've seen before include "Implied, unstated" , "Implied, not spoken" , "Not said though understood" , "Unspoken but understood" , "Unrecorded" .)

I've seen this clue in The Mirror.

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