reciprocal

mutual, common, joint, reciprocal

这些形容词均含“共同的、相互的”之意。
mutual: 着重彼此共有或共享，局限于双方的关系。
common: 侧重两人或多人共有共同，但不暗示彼此间存在的等价关系。
joint: 强调至少两人或两方共同占用，侧重指一个统一体。
reciprocal: 着重互惠，有来有往。

名词 reciprocal:

1. something (a term or expression or concept) that has a reciprocal relation to something else
2. (mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2; the multiplicative inverse of 7 is 1/7
   同义词：multiplicative inverse
3. hybridization involving a pair of crosses that reverse the sexes associated with each genotype
   同义词：reciprocal cross

形容词 reciprocal:

1. concerning each of two or more persons or things; especially given or done in return
   同义词：mutual
2. of or relating to the multiplicative inverse of a quantity or function

1. The reciprocal of impedance.
   导纳阻抗的对等物
2. Involving interchange; reciprocal.
   涉及交换的; 相互的
3. They have a reciprocal agreement to combat terrorism.
   他们有相互配合的协定，共同与恐怖主义作斗争。
4. They show reciprocal affection to each other.
   他们表达了彼此之间的爱慕。

re.cip.ro.cal

adj.Abbr. recip.（形容词）缩写 recip.
Concerning each of two or more persons or things.
交互的，相互的：关于两个或多个人或物中的每一个的
Interchanged, given, or owed to each other:
互换的，交换的：相互之间互换、给予或拥有的：
例句：
reciprocal agreements to abolish customs duties; a reciprocal invitation to lunch.
关于取消关税互惠的协定；互邀共进午餐

Performed, experienced, or felt by both sides:
相互的：均被双方表现、经历或感觉到的：
例句：
reciprocal respect.
相互尊重

Interchangeable; complementary:
互补的，可互换的：可相互对换的；免费赠送的：
例句：
reciprocal electric outlets.
可互换的电插座

Grammar Expressing mutual action or relationship. Used of some verbs and compound pronouns.
【语法】 相互代名词的：表达相互之间的行为或关系的。用于修辞一些动词和复合名词
Mathematics Of or relating to the reciprocal of a quantity.
【数学】 相反的，倒数的：属于或关于某一量的倒数的
Physiology Of or relating to a neuromuscular phenomenon in which the excitation of one group of muscles is accompanied by the inhibition of another.
【生理学】 交互神经的：属于或关于这样一种神经肌肉现象的，即一组肌肉的兴奋总伴随着另一组肌肉的抑制
Genetics Of or designating a pair of crosses in which the male parent in one cross is of the same genotype or phenotype as the female parent in the other cross.
【遗传学】 倒易移位的：属于或表明一对混血种的，其中一个混血种的父亲与另一个混血种的母亲具有相同的基因型或表现型
n.Abbr. recip.（名词）缩写 recip.
Something that is reciprocal to something else.
相互，互惠：与其他事物相对等、相关联的事物
Mathematics A number related to another in such a way that when multiplied together their product is . For example, the reciprocal of 7 is !/7; the reciprocal of "/3 is #/2.
【数学】 倒数：一个与另一个数乘积为的数。例如，7的倒数是!/7；"/3的倒数是#/2

来源：
From Latin reciprocus [alternating] * see per
源自 拉丁语 reciprocus [交互的] *参见 per

【引伸】
recip.rocal.ity
recip.rocally
adv.（副词）