(computer science) the time it takes for a specific block of data on a data track to rotate around to the read/write head
"The hard drive's slow performance was caused by high latency as the spinning platter waited for the correct data sector to align with the read/write head."
the time that elapses between a stimulus and the response to it
"The computer program had high latency, causing a noticeable delay between clicking the button and the screen updating."
the state of being not yet evident or active
"The new policy remained in a state of latency within the organization until leadership finally announced it to the public."
The state of being latent.
"The potential danger remains in latency, waiting quietly beneath the surface until a sudden storm triggers its release."
In plain English: Latency is the delay between when you do something and when you see the result happen.
"The high latency caused a noticeable delay when I tried to load my website."
The word latency comes from the Latin root latent, meaning hidden or lying dormant, combined with the suffix -ency to form a noun. It entered English through French and originally described something that was concealed before coming into view.