“Transcendentalism” was a philosophical movement that was popular in New England, from about 1820 to 1850. Emerson, Thoreau, and many other famous NE authors were Transcendalists.
The movement seems to have died out after the Civil War-did anyone revive it in modern times? Does it exist today (in a different form)?
I would personally qualify if forced to concede the label at knifepoint; it’s likely that many people are operating under its (broad) principles without actually labeling themselves as such-such as various New Age sects.