1. a partial payment of a debt or purchase price, made at regular intervals until the full amount is paid
Usage: Also spelled 'installment' in U.S. English; Common in finance and retail contexts
2. one of the separate parts of a serialized story, publication, or broadcast released at intervals
Usage: Common in publishing, television, and film

Examples

• She paid for the car in monthly instalments over five years.
• The final instalment of the loan is due next month.
• The new book will be released in four instalments.
• Fans eagerly awaited the next instalment of the popular series.
• You can buy the furniture on instalments with no interest for 12 months.
• The third instalment of the film trilogy broke box office records.