installment in WordNet English dictionary

1. a part of a broadcast serial
   episode  installment  instalment 
   
2. the act of installing something (as equipment)
   "the telephone installation took only a few minutes"
   installation  installing  installment  instalment 
   
3. a part of a published serial
   installment  instalment 
   
4. a payment of part of a debt; usually paid at regular intervals
   installment