1. [n]  seizing property that belongs to someone else and holding it until profits pay the demand for which it was seized
2. [n]  the act of segregating or sequestering; "sequestration of the jury"
3. [n]  a writ that authorizes the seizure of property
4. [n]  the action of forming a chelate or other stable compound with an ion or atom or molecule so that it is no longer available for reactions

SEQUESTRATION is a 13 letter word that starts with S.