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retardation
retarded
retch
retd.
rete
retell
retelling
retene
retention
retentive
retentivity
rethink
retia
retiarius
reticent
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retention

re·ten·tion [ ri ténsh'n ]


noun 
Definition:
 
1. keeping or holding of something: the act of retaining something or the condition of being retained

2. memory: the ability to remember things

3. physiology holding in of waste: the holding in the body of waste that is normally excreted

[14th century. Directly or via French< Latin retention-< past participle of retinere (see retain)]
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