inverse (ɪnˈvɜːs, ˈɪnvɜːs)  
—adj  
1.  opposite or contrary in effect, sequence, direction, etc 
2.  maths 
a. (of a relationship) containing two variables such that an increase in one results in a decrease in the other: the volume of a gas is in inverse ratio to its pressure  
b. (of an element) operating on a specified member of a set to produce the identity of the set: the additive inverse element of x is x, the multiplicative inverse element of x is 1/x  
3.  (usually prenominal) upsidedown; inverted: in an inverse position 
—n  
4.  maths 
a. another name for reciprocal  
b. an inverse element  
5.  logic a categorial proposition derived from another by changing both the proposition and its subject from affirmative to negative, or vice versa, as all immortals are angels from no mortals are angels 
[C17: from Latin inversus, from invertere to  
in'versely  
—adv 
inverse
Adjective (ĭnvûrs') Relating to a mathematical operation whose nature or effect is the opposite of another operation. For example, addition and subtraction are inverse operations, as are multiplication and division. Noun (ĭn'vûrs')
