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n.

1. 1. The act of retaining.
   2. The condition of being retained.
2. Capacity or power of retaining.
3. An ability to recall or recognize what has been learned or experienced; memory.
4. Something retained.
5. Involuntary withholding of bodily wastes or secretions that are normally eliminated.

[Middle English retencioun, from Old French retention, from Latin retentiō, retentiōn-, from retentus, past participle of retinēre, to retain. See retain.]

In securities underwriting, the number of units allocated to a participating investment banker (Syndicate member) minus the units held back by the syndicate manager for facilitating institutional sales and for allocation to firms in the selling group that are not also members of the syndicate. See also Underwrite.

(rē-ten′shən)
n

1. power to retain; capacity for retaining; the inherent property of a restoration to maintain its position without displacement under stress; results from close adaptation of the restoration to the prepared form of the tooth, usually aided by cement. n 2. term relating to the provision in cavity preparation for preventing displacement of a restoration. Retention supplements resistance form and is specifically created to resist any lateral or tipping force that may be brought against the restoration during and after its insertion. n 3. resistance of a denture to removal in a direction opposite that of its insertion; the quality inherent in the denture that resists the force of gravity, adhesiveness of foods, and forces associated with the opening of the jaws. n 4. the period of treatment during which the individual wears an appliance to maintain the teeth in the desired position.

1. The withholding of a portion (usually 10%) of a periodic payment to a contractor, by prior agreement, for work completed. The retention is held in escrow for a stipulated time period after the acceptance of the completed work by the architect and owner/payee.
2. The amount of preservative, fire-retardant salt, resin, etc., retained by treated or impregnated wood.

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The maintenance of learning so that it can be utilized later, as in recognition, or relearning.

The process of holding back or keeping in a position, such as persistence in the body of material normally excreted. See also retained.

• renal r. cysts — these are acquired and result from scarring and obstruction of tubules in chronic renal disease.
• urine r. — accumulation of urine within the bladder because of inability to urinate.

IN BRIEF: The keeping of a thing within one's power or possession; memory.

Retention of important concepts, dates, and facts can be important when taking a test.

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Dansk (Danish)
n. - bibeholdelse, hukommelse

Nederlands (Dutch)
vasthouding, geheugen

Français (French)
n. - mémoire, maintien, (Méd) rétention

Deutsch (German)
n. - Beibehaltung, Speicherung, Verhaltung

Ελληνική (Greek)
n. - επίσχεση, συγκράτηση, διατήρηση, κράτηση, μνημονικό

Italiano (Italian)
ritenzione

Português (Portuguese)
n. - retenção (f)

Русский (Russian)
удерживание, сохранение

Español (Spanish)
n. - retención, retentiva, memoria

Svenska (Swedish)
n. - kvarhållande, bibehållande

中文（简体） (Chinese (Simplified))
保留, 记忆力, 保持, 闭尿

中文（繁體） (Chinese (Traditional))
n. - 保留, 記憶力, 保持, 閉尿

한국어 (Korean)
n. - 보유, 보유력, 유치

日本語 (Japanese)
n. - 保持, 保存, 保留, 保持する力, 記憶力, 保有

العربيه (Arabic)
‏(الاسم) إستبقاء, إحتفاظ, إحتجاز‏

עברית (Hebrew)
n. - ‮שמירה, זיכרון, החזקה‬

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Water Retention