Able to be discovered, found, or revealed; capable of being uncovered or learned.
From discover (Old French 'descouvrir': des- + couvrir, meaning to uncover) plus -able (capable of being). The word combines the idea of removing cover with the suffix indicating possibility.
In law, 'discoverable' evidence is what lawyers can legally force the other side to hand over—so your secrets aren't safe if they're discoverable, which is why companies carefully delete emails!
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