Retention

Noun

 * 1) The act of retaining or something retained
 * 2) The act or power of remembering things
 * 3) A memory, what is retained in the mind
 * 4)  The involuntary withholding of urine and faeces

Adjectives for Retention
undue; stubborn; corresponding; enforced.

Thesaurus
retentive, retentiveness, retentivity, retentorabnegation, adhesiveness, bullheadedness, camera-eye, cohesiveness, consistency, contradiction, declension, declination, declinature, declining, denial, deprivation, disagreement, disallowance, disclaimer, disclamation, disobedience, dissent, eidetic memory, gluiness, glutinosity, gumminess, holding back, memory span, nay, negation, negative, negative answer, nix, no, nonacceptance, noncompliance, nonconsent, nonobservance, obstinacy, persistence, persistency, photographic memory, recantation, refusal, rejection, repudiation, retentive memory, retentiveness, retentivity, snugness, stick-to-itiveness, stickiness, stubbornness, tackiness, tenaciousness, tenacity, thumbs-down, tightness, total memory, total recall, toughness, turndown, unwillingness, viscidity, viscosity, withholding