Etymology
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convulsion (n.)

1580s, "a violent and involuntary contraction of the muscular parts of the body," from Latin convulsionem (nominative convulsio) "cramp, convulsion," noun of action from past-participle stem of convellere "to tear loose," from assimilated form of com "with, together" (see con-) + vellere "to pluck, pull violently" (see svelte).

Meaning "any violent or irregular (social, political, etc.) motion, turmoil" is from 1640s. Of laughter, 1735. Related: Convulsions; convulsional.

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Definitions of convulsion

convulsion (n.)
a sudden uncontrollable attack;
convulsions of laughter
Synonyms: paroxysm / fit
convulsion (n.)
violent uncontrollable contractions of muscles;
convulsion (n.)
a violent disturbance;
the convulsions of the stock market
Synonyms: turmoil / upheaval
convulsion (n.)
a physical disturbance such as an earthquake or upheaval;
From wordnet.princeton.edu