 IN MATH: 1. n. an operation which undoes another operation. EX. Addition of 5 undoes subtraction of 5.

```
OPERATION				ITS INVERSE
multiplication			division
squaring				square-rooting
raising to the second power	raising to the 1/2 power
taking the opposite			taking the opposite
taking the reciprocal		taking the reciprocal
```

2. n. for addition, the opposite; for multiplication, the reciprocal: for an operation with an identity, one number of a pair of numbers whose operation together results in the identity. FOR EXAMPLE:

```     number, operation, inverse, identity
5       +         -5    =  0
-5       +         5    =  0
5      times      1/5   is 1
1/5      times      5   is 1```

ENGLISH: 1. as defined in #1 above.

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