To open or reveal something that was closed or hidden; to disclose.
From dis- (reversal/opening) + inclose (an older spelling of 'enclose,' from en- + close). The prefix dis- reverses the enclosing action, meaning to open up or reveal what was enclosed or hidden.
This is a rare word that shows English once had systematic opposites: if 'inclose' meant to enclose or hide, then 'disinclose' naturally meant to reveal or open up. It fell out of use because 'disclose' (without the 'in') became standard, but it reveals the old architecture of English word-building.
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