1. 紧密性：Kyle(1985)认为市场流动性是一个难以捉摸和定义的概念,指出市场流动性是指影响交易成本的各项指标,具体包括紧密性(tightness)、弹性(resiliency)和深度(depth)三个指标[5].

2. 紧：这个处理方法和Rudin书上的方法一致,陈书上也是这样处理的. 这种处理方法看起来观点很高,但我感觉实用性不强,倒是容度的方法很有意思,在loeve的概率论书上,有些胚紧(Tightness)的结论就是用这个方法解决的.

3. 紧度：2.紧度(tightness). 紧度指交易价格偏离市场中间价的幅度. 由于市场中国债的买价和卖价常常并不完全等同,市场参与者改变交易位置即意味着交易价格的变化,因而紧度也指短期内改变交易位置的成本. 国债交易的紧度主要取决于债券的存货管理成本和交易风险,

4. 气密性：tightening torque 拉紧转矩 | tightness 气密性 | tightness test 气密性试验

1. lack of movement or room for movement

    Synonym: tautness

2. extreme stinginess

    Synonym: meannessminginessniggardlinessniggardnessparsimonyparsimoniousnesstightfistednesscloseness

3. the spatial property of being crowded together

    Synonym: concentrationdensitydensenesscompactness

4. a tight feeling in some part of the body

    e.g. he felt a constriction in her chest
           she felt an alarming tightness in her chest
           emotion caused a constriction of his throat

    Synonym: constriction

5. a state occasioned by scarcity of money and a shortage of credit

    Synonym: stringency