oscillation

nouns

the process of oscillating between states
is derived from
is a type of (narrower)
a process existing in or produced by nature (rather than by the intent of human beings)
"the action of natural forces"; "volcanic activity"
(physics) a regular periodic variation in value about a mean
is derived from
a single complete execution of a periodically repeated phenomenon
"a year constitutes a cycle of the seasons"
is derived from