Rate of inflation started going down only after the fed intervened and increased rates by around 3-4 percent to make it go down again (I presented the chart above). The fed actively worked to make it go down. It's funny to say that it was temporary when inflation decreased after actions to tame it were done.I already posted a definition above--not permanent. Even your links say things like "not persistent" and have an example "the transitory nature of life". Life, at least for most animals in on the time scale of years to decades. They didn't use words like fleeting, ephemeral, or or momentary that refer to quite short periods. They used a word that means non-persistent.
Either way, you are missing the point. Inflation did not last. Call that what you want. The key was that inflation was so severe that even if it did not last, the fed should have acted sooner. It is the severity, not the duration that was their problem.
Their assumption was that they would not need to intervene inorder for it to go down and they were wrong.