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The Japanese word

交際

is pronounced
kousai | こうさい
means
company, friendship, association, society, acquaintance
Examples:
君は彼と交際しない方がよい。
kimi wa kare to kōsai shi nai hō ga yoi.
You had better not keep company with him.
彼は三年間メアリーと交際している。
kare wa san nenkan mearī to kōsai shi te iru.
He has been keeping company with Mary for three years.
彼との交際で得るところが多かった。
kare to no kōsai de eru tokoro ga ōkatta.
I benefited much from my association with him.
そんな利己的な男と交際してはいけない。
sonna riko teki na otoko to kōsai shi te wa ike nai.
Don't keep company with such a selfish man.
彼女は一度も女の社会で交際したことがなかった。
kanojo wa ichi do mo onna no shakai de kōsai shi ta koto ga nakatta.
She had never mingled in the society of women.
Examples sourced from tatoeba.org