1The act of focusing one's attention, effort, or mental energy on a single task; concentrating.
静かな部屋で集中して本を読んだ。
I read the book with full concentration in a quiet room.
雑音が多くて仕事に集中できない。
There's too much noise, so I can't concentrate on my work.
締め切り前は他のことを忘れて集中する。
Right before a deadline I forget everything else and focus.
コーチは選手たちに試合に集中するよう声をかけた。
The coach told the players to focus on the match.
2The concentration or centralization of people, resources, or power in one place; a clustering or convergence.
大都市への人口集中が住宅不足を招いている。
The concentration of population in big cities is causing a housing shortage.
台風の影響で注文が一時期に集中した。
Because of the typhoon, orders became concentrated in a short period.
権力の集中を防ぐために三権分立という仕組みがある。
The separation of powers exists to prevent the concentration of power.
工場が一地域に集中すると環境への負担が大きくなる。
When factories are concentrated in one area, the burden on the environment grows.
3Used of publications, exhibitions, or lectures when material on one theme or author is gathered and presented together in a block.
この夏休みに集中講義で単位をまとめて取った。
I earned my credits all at once through an intensive concentrated course over summer break.
雑誌はその作家の短編を集中掲載した特集を組んだ。
The magazine ran a special feature concentrating on that author's short stories.