knight-service

/N AY1 T S ER0 V AH0 S/
noun
  1. 1

    The military service a knight owed under the feudal system as a condition of holding his lands; hence, the system of land tenure based on such service.

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Source: https://en.wiktionary.org/wiki/knight%20service, https://en.wiktionary.org/wiki/knight-service