A period of two consecutive years; used commonly in academic, governmental, and budgeting contexts.
From Latin 'biennium', composed of 'bi-' (two) + 'annus' (year), adopted directly into English for formal contexts requiring precision about two-year cycles.
Universities and governments love 'biennium' because it removes all ambiguity—budgets are approved 'for the 2024-2025 biennium,' making it crystal clear without confusion about whether years overlap.
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