Etymology
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dormancy (n.)

1723, state of being dormant, quiescence;" see dormant + -cy. Middle English had dormitacioun "sleep, sleeping" (mid-15c.)

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latency (n.)
1630s, "condition of being concealed, unobserved existence," from latent + abstract noun suffix -cy. Meaning "delay between stimulus and response" is from 1882 (perhaps via the notion of "dormancy"); computer sense (latency time) is from 1954.
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