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Noun retention has 3 senses
  1. retention, keeping, holding - the act of keeping in your possession
    --1 is a kind of possession, ownership
    --1 has particulars: withholding; storage
    Derived form: verb retain3
  2. memory, retention, retentiveness - the power of retaining and recalling past experience; "he had a good memory when he was younger"
    --2 is a kind of faculty, mental faculty, module
    --2 has particulars: remembrance, recollection, anamnesis
    Derived form: verb retain4
  3. retentiveness, retentivity, retention - the power of retaining liquid; "moisture retentivity of soil"
    --3 is a kind of impermeability, impermeableness
    --3 has particulars: urinary retention
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