DECENNIAL Meaning of DECENNIAL in English transcription, транскрипция: [ dɪˈsenjəl ]adj. 1 lasting ten years. 2 recurring every ten years. øødecennially adv. [L decennis of ten years f. decem ten + annus year] English main colloquial, spoken dictionary. Английский основной разговорный словарь. 2012