Able to be forced or required to do something, especially legally required to testify.
From 'compel' (Latin 'compellere', to drive together) plus the suffix '-able' (from Latin 'abilis', capable of being). Creates an adjective meaning 'capable of being compelled.'
Witnesses are 'compellable' in court, but spouses weren't always—the evolution of who is compellable to testify tracks the history of marriage law and spousal privilege.
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