- retention, keeping, holding - the act of keeping in your possession
--1 is a kind of possession, ownership
--1 has particulars: withholding; storageDerived form: verb retain3 - 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, anamnesisDerived form: verb retain4 - retentiveness, retentivity, retention - the power of retaining liquid; "moisture retentivity of soil"
--3 is a kind of impermeability, impermeableness
--3 has particulars: urinary retention