(noun) a payment of part of a debt; usually paid at regular intervals.
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Noun Definition 1
(noun) a part of a broadcast serial. Synonyms: episode, instalment.
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Noun Definition 2
(noun) a part of a published serial. Synonyms: instalment.
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Noun Definition 3
(noun) the act of installing something (as equipment). Synonyms: installation, installing, instalment. Examples: "The telephone installation took only a few minutes."