Source : Webster's Revised Unabridged Dictionary (1913)

Conacre \Con*a"cre\, v. t.
   To underlet a portion of, for a single crop; -- said of a
   farm. [Ireland]

Conacre \Con*a"cre\, n.
   A system of letting a portion of a farm for a single crop.
   [Ireland] Also used adjectively; as, the conacre system or
   principle. --Mozley & W.