noun place of custody or confinement.
2. retention ·noun the power of retaining; retentiveness.
3. retention ·noun the act of withholding; retraint; reserve.
4. retention ·noun the act of retaining, or the state of being ratined.
5. retention ·noun that which contains something, as a tablet; a //// of preserving impressions.
6. retention ·noun the right of withholding a debt, or of retaining property until a debt due to the person claiming the right be duly paid; a lien.