noun
a thing, person, or event that causes awe, admiration, or amazement.
The Brooklyn Bridge was an engineering marvel of the time.
He is a marvel of stamina.
transitive verb
to be filled with awe or amazement at (usually followed by a clause beginning with “that”).
I marvel that you escaped alive.
intransitive verb
to be filled with awe or amazement (usually followed by “at”).
The audience marveled at the magician’s tricks