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Webster 1913 Edition

Noun.

(O. Eng. Law)

An officer in the Court of King’s Bench and Common Pleas whose duty it was to make out exigents. The office is now abolished.

Cowell.

Noun.

An officer in the court of Common Pleas in England who makes out exigents and proclamations, in cases of outlawry.

exigenter ‎(plural exigenters)

(Britain, law, obsolete) An officer in the Court of King's Bench and Common Pleas whose duty it was to make out exigents.
(Can we find and add a quotation of Cowell to this entry?)