propitiation
Hilasmos denotes what is said of the Son in relation to sins, including sins beyond those of the immediate readers.
The two occurrences use the noun for what the Son is said to be or sent as in relation to sins: 1 John 2:2 extends the statement beyond the readers' sins, while 1 John 4:10 places it within God's love in sending his Son.
Senses in use
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What the Son is in relation to sins · dominant
In 1 John 2:2, the nominative singular form identifies him as what concerns "our sins" and also "the sins of the whole world" in the APB rendering. In 1 John 4:10, the accusative singular form occurs after God sent his Son, and the APB renders the clause "sent his Son as the propitiation for our sins."
In the Anselm Project Bible: Across both verses, the APB uses "propitiation" in clauses relating the Son to sins. This rendering indicates the clauses' presentation rather than isolating every contribution of the Greek noun.