- 1. a. Happening every eighth year; also, lasting a period of eight years. Source: opted
- 2. Happening every eighth year; also, lasting a period of eight years. Johnson. -- Oc*ten"ni*al*ly, adv. Source: webster
- 3. Happening every eighth year; also, lasting a period of eightyears. Johnson.-- Oc*ten"ni*al*ly, adv. Source: adambom
- 4. a. Happening every eighth year; also, lasting a period of eight years. Source: ecdict
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octennial
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