retention

US /rɪˈtɛnʃən/

UK /rɪˈtenʃn/

B2
n. (u.)Uncountable NounAct of holding something inside the body
A lack of fiber from fruits causes retention of feces
n. (u.)Uncountable NounAct of keeping or holding someone or something
Customer retention depends on how well you treat them
n. (u.)Uncountable NounAbility to remember something for a long time
He has a good retention for historical dates

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