superfluity
/ˌsjuːpəˈflʊətɪ/noun
(pl.-ies)［in sing.］
1- an unnecessarily or excessively large amount or number of something多余, 过量, 过多：
a superfluity of unoccupied time.
过多的空闲时间。
1.1
- an unnecessary thing非必需品, 多余物：
they thought the garrison a superfluity.
他们认为守备部队是多余的。
1.2
- mass noun the state of being superfluous多余：
footservants who had nothing to do but to display their own superfluity.
无事可做, 显得多余的跑腿仆人。
词源
late Middle English: from Old French superfluite, from late Latin superfluitas, from Latin superfluus 'running over' （see SUPERFLUOUS）.