[せつどうろん, setsudouron] (n) perturbation theory (physics) [Add to Longdo]
Result from Foreign Dictionaries (2 entries found)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Perturbation \Per`tur*ba"tion\, n. [L. perturbatio: cf. F.
perturbation.]
1. The act of perturbing, or the state of being perturbed;
esp., agitation of mind.
[1913 Webster]
2. (Astron.) A disturbance in the regular elliptic or other
motion of a heavenly body, produced by some force
additional to that which causes its regular motion; as,
the perturbations of the planets are caused by their
attraction on each other. --Newcomb.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
perturbation
n 1: an unhappy and worried mental state; "there was too much
anger and disturbance"; "she didn't realize the upset she
caused me" [syn: {disturbance}, {perturbation}, {upset}]
2: (physics) a secondary influence on a system that causes it to
deviate slightly
3: activity that is a malfunction, intrusion, or interruption;
"the term `distress' connotes some degree of perturbation and
emotional upset"; "he looked around for the source of the
disturbance"; "there was a disturbance of neural function"
[syn: {perturbation}, {disturbance}]
4: a disposition that is confused or nervous and upset [syn:
{perturbation}, {fluster}]
5: the act of causing disorder [syn: {disruption},
{perturbation}]
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