半はん減げん期きMeaningsNoun1. half lifeKanji used半half減reduction期period (of time)Pitch accentはんげんきComposed of半はん減げんreduction by half; halvingNoun期きperiod; time; opportunity; chance; occasion; age; term (e.g. in office); session (e.g. of parliament); stage (e.g. of a disease); season (e.g. of a TV series)Noun