Holman Bible Dictionary 
Easton's Bible Dictionary 
Morrish Bible Dictionary 
Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
(Heb. le-annoth', לְעִנּוֹת ,for Answering, i.e. singing; Sept. Τοῦ Ἀποκριθῆναι , Vulg. Ad Respondendurn ) , a musical direction occurring in the title of Psalms 88, and denoting that it was to be chanted in the manner indicated by the associated terms. (See Book Of Psalms).