Webster's English Dictionary

continual

con.tin.u.al \k*n-'tin-y*(-w*)l\ \-e-\ aj [ME, fr. MF, fr. L continuus 
   continuous] 1: continuing indefinitely in time without interruption {~ 
   fear}  2: recurring in steady rapid succession  3: forming a continuous 
   series PERENNIAL: CONTINUAL implies a close prolonged succession or 
   recurrence; CONTINUOUS usu. implies an uninterrupted flow or spatial 
   extension; CONSTANT implies uniform or persistent occurrence or recurrence; 
   INCESSANT implies ceaseless or uninterrupted activity; PERPETUAL suggests 
   unfailing repetition or lasting duration; PERENNIAL implies enduring 
   existence often through constant renewal - con.tin.u.al.ly av SYN syn 
   CONTINUOUS, CONSTANT, INCESSANT, PERPETUAL,