名詞 perturbation:

1. an unhappy and worried mental state
   同義詞：disturbance, upset
2. (physics) a secondary influence on a system that causes it to deviate slightly
3. activity that is an intrusion or interruption
   同義詞：disturbance
4. a disposition that is confused or nervous and upset
   同義詞：fluster
5. the act of causing disorder
   同義詞：disruption

per.tur.ba.tion

n.（名詞）

The act of perturbing.
情緒不穩(wěn)，心神不寧：焦慮煩惱的行為
The state of being perturbed; agitation.
攪亂，混亂：處于不安的狀態(tài)；動蕩

A small change in a physical system.
微擾：物理體系中的微小變化
Physics Astronomy Variation in a designated orbit, as of a planet, resulting from the influence of one or more external bodies.
【物理學(xué)】 【天文學(xué)】 微擾，攝動：在固定軌道中的變化，如行星，由一個(gè)或多個(gè)外部物體的影響引起

【引伸】
per.turba.tional
adj.（形容詞）