first party

Noun

Japanese Meaning

取引に直接関与する当事者（買い手、売り手など） / 訴訟における原告

The first party must provide proof of purchase before the dispute can be resolved.

紛争を解決する前に、買い手または売り手が購入証明を提示しなければなりません。

Sense（1）

(business, commerce) An individual or entity directly involved in a given transaction, such as a buyer or seller.

Sense（2）

(law) The plaintiff in a lawsuit.

first parties

（ plural ）