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perturbation
/ˌpɚtɚˈbeɪʃən/
US
UK
noun
plural -tions
technical :a change in the normal state or regular movement of something [count]
a
perturbation
in
the
planet's
orbit
[
noncount
]
gravitational
perturbation
[noncount] formal :the state of being worried or upset
mental
/
emotional
perturbation
US