Etymology
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latent (adj.)

mid-15c., "concealed, secret," from Latin latentem (nominative latens) "lying hid, concealed, secret, unknown," present participle of latere "lie hidden, lurk, be concealed," from PIE *late-, suffixed form of root *lādh- "to be hidden" (source also of Greek lēthē "forgetfulness, oblivion," lēthargos "forgetful," lathre "secretly, by stealth," lathrios "stealthy," lanthanein "to be hidden;" Old Church Slavonic lajati "to lie in wait for"). Meaning "dormant, undeveloped" is from 1680s, originally in medicine.

updated on January 12, 2019

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Definitions of latent from WordNet

latent (adj.)
potentially existing but not presently evident or realized;
a latent fingerprint
latent talent
latent (adj.)
(pathology) not presently active;
latent diabetes
latent infection
From wordnet.princeton.edu, not affiliated with etymonline.