The Collaborative International Dictionary
Esnecy
Esnecy \Es"ne*cy\, n. [See Eigne.] (Eng. Law)
A prerogative given to the eldest coparcener to choose first
after an inheritance is divided.
--Mozley & W.
Wiktionary
esnecy
n. (context UK legal obsolete or historical English) A prerogative given to the eldest coparcener (or whomever of the coparceners is so entitled by a court) to choose first after an inheritance is divided.