The Collaborative International Dictionary of English v.0.48:

Quaere \Qu[ae]"re\, v. imperative. [L., imperative of quaerere
   to seek.]
   Inquire; question; see; -- used to signify doubt or to
   suggest investigation.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

QUAERE, practice. A word frequently used to denote that an inquiry ought to
be made of a doubtful thing. 2 Lill. Ab. 406.