Webster's English Dictionary

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contribution

con.tri.bu.tion \.ka:n-tr*-'byu:-sh*n\ \k*n-'trib-y*t-iv\ n 1: an esp. 
   extraordinary levy or tax  2: the act of contributing; also : the sum or 
   thing contributed  3: a writing for publication esp. in a periodical  - 
   con.trib.u.tive aj