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sesquiennial [ˌsɛskwɪˈɛnɪəl] adj.stresses
gen. происходящий один раз в полтора года (Occurring once every one and a half years (i.e. once every 18 months, or twice every three years). An example of sesquiennial is taking a vacation every eighteen months (sesqui- means "one and a half") 'More)