[fanf2]

"Propagate" is the traditional term for DNS update delays. It dates back to the era before NOTIFY and IXFR when it often took a long time for secondary servers to update their copies of a zone. Nowadays with a good setup that should happen within a few seconds.

Perhaps it is a bit of a misnomer to use it for cache timeouts, but it isn't particularly wrong or confusing unless you have a very pedantic reader.