retention

名词 retention:

1. the act of retaining something
   同义词：keeping, holding
2. the power of retaining and recalling past experience
   同义词：memory, retentiveness, retentivity
3. the power of retaining liquid
   同义词：retentiveness, retentivity

re.ten.tion

n.（名词）

The act of retaining.
保持：保持的行为
The condition of being retained.
保留，滞留：被保持的状态
Capacity or power of retaining.
保持力，持续力
An ability to recall or recognize what has been learned or experienced; memory.
记忆力：记起或认识出已经学过或经历过的事物的能力；记忆力
Something retained.
被保持物
Medicine Involuntary withholding of wastes or secretions that are normally eliminated.
【医学】 停滞：正常情况下应被除去的废物或分泌物的不自觉的保留

来源：
Middle English retencioun
中古英语 retencioun
from Old French retention
源自 古法语 retention
from Latin retentiô retentiôn-
源自 拉丁语 retentiô retentiôn-
from retentus [past participle of] retinôre [to retain] * see retain
源自 retentus [] retinôre的过去分词 [保持] *参见 retain