Webster's English Dictionary

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occasional

oc.ca.sion.al \-'ka-zh-n*l, -*n-*l\ \-e-\ aj 1: occurring or operating on a 
   particular occasion  2: acting as the occasion or contributing cause of 
   something  3: composed for a particular occasion {~ verse}  4: met with, 
   appearing, or occurring at irregular or rare intervals  5: acting in a 
   specified capacity from time to time  6: designed or constructed to be used 
   as the occasion demands  - oc.ca.sion.al.ly av