What is Quare?

Legal Definition
Pleadings. Wherefore. This word is sometimes used in the writ in certain actions, but is inadmissible in a material averment in the pleadings, for it is merely interrogatory and, therefore, when a declaration began with complaining of the defendant, "wherefore with force, &c. he broke and entered" the plaintiff's close, was considered ill. Bac. Ab. Pleas, B 5, 4; Gould on Pl. c. 3, 34.
-- Bouviers Law Dictionary
Legal Definition
Lat Wherefore; for what reason; on what account Used in the Latin form of several common-law writs.
-- Black's Law Dictionary
Legal Definition
Wherefore; why.
-- Ballentine's Law Dictionary