Translations to be checked

• ttbc Dutch: opbrengst
• ttbc French: rétention
• ttbc Turkish: aklında tutabilmek

Retention can have the following meanings:

• Retention basin, instance retaining (e.g. water in the ground)
• In learning: it is the ability to retain facts and figures in memory (spaced repetition)
• Grade retention, in schools, keeping a student in the same grade for another year (that is, not promoting the student to the next higher grade with his/her classmates)
• Retention period, in Usenet, the time a news server holds a newsgroup posting before deleting it as no longer relevant
• Judicial retention, in the United States court system, a process whereby a judge is periodically subject to a vote in order to remain in the position of judge
• Urinary retention, the lack of ability to urinate

abnegation, 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