downpayment

noun
  1. 1

    A payment representing a fraction of the price of something being purchased, made to secure the right to continue making payments towards that purchase.

  2. 2

    (by extension) Any initial commitment signifying an intention to carry out a larger future commitment, even though no legal rights or obligations are secured.

Synonyms

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Source: https://en.wiktionary.org/wiki/down%20payment, https://en.wiktionary.org/wiki/downpayment