retention
US /rɪˈten.ʃən/
UK /rɪˈten.ʃən/

1.
the continued possession, use, or control of something
:
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The company focuses on customer retention.
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Employee retention is crucial for long-term success.
2.
the ability to keep something in mind or remember it
:
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His memory retention is excellent.
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Reading helps improve information retention.
3.
the action of absorbing and holding a substance
:
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Soil retention of water is vital for plant growth.
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The dam's primary function is water retention.