Plural of bonus; monetary or other rewards given in addition to regular payment.
From Latin bonus (good). In English, 'boni' appears primarily in legal and financial Latin phrases, though the standard English plural 'bonuses' is far more common.
Latin plurals like 'boni' survive in English mainly in formal contexts—you'd see this in ancient legal documents or when quoting classical Latin, but modern business just uses 'bonuses.' It's a linguistic fossil.
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