Source : Webster's Revised Unabridged Dictionary (1913)

Motherliness \Moth"er*li*ness\, n.
   The state or quality of being motherly.

Source : WordNet®

motherliness
     n : the quality of having or showing the tenderness and warmth
         and affection of or befitting a mother; "the girl's
         motherliness made her invaluable in caring for the
         children" [syn: {maternalism}, {maternal quality}, {maternity}]