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The Japanese word

定員

is pronounced
teiin | ていいん
means
fixed number of regular personnel, capacity (of boat, hall, aeroplane, etc.)
Examples:
このエレベーターの定員は10人だ。
kono erebētā no teīn wa ichi zero nin da.
This elevator's capacity is ten people.
ボートは定員オーバーでバランスを失った。
bōto wa teīn ōbā de baransu o ushinatta.
The boat was off balance because it was overloaded.
Examples sourced from tatoeba.org