is generally any circuit or code that retains a signal (or level).
Intended or otherwise.
that would mean a register is a latch. I don't think this is the most common definition (even though it is used sometimes).
Wikipedia quotes the following paragraph
"Sometimes the terms flip-flop and latch are used interchangeably, but there is a distinction. A latch is transparent during a positive clock, whereas a FF is only transparent during a brief interval during the clock transition (edge)."
from
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which is consistent with my understanding (this isn't supposed to prove anything, just my opinion).
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