retention

Short definition from Wiktionary

Noun

1. 1
   The act of retaining or something retained.
2. 2
   The act or power of remembering things.
3. 3
   Memory; what is retained in the mind.
4. 4
   The involuntary withholding of urine and faeces.
5. 5
   The length of time a patient remains in treatment.
6. 6
   That which contains something, as a tablet; a means of preserving impressions.
7. 7
   The act of withholding; restraint; reserve.
8. 8
   A place of custody or confinement.
9. 9
   The right to withhold a debt, or of retaining property until a debt due to the person claiming the right is duly paid; a lien.
10. 10
    The portion of a potential damage that must be paid for by the holder of an insurance policy.