Unscramble Usation

What is the meaning of word usation unscrambled?

What 7 letter words can be made from letters U S A T I O N:

Make more words by adding or removing letters

How many 6 letter words can you make from letters U S A T I O N?

1. Austin - Definition of Austin

2. outsin - Definition of outsin

3. Siouan - Definition of Siouan

4. tauons - Definition of tauons

Which 6 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter U and unscrambling sation
2) Removing the letter S and unscrambling uation
3) Removing the letter A and unscrambling ustion
4) Removing the letter T and unscrambling usaion
5) Removing the letter I and unscrambling usaton
6) Removing the letter O and unscrambling usatin
7) Removing the letter N and unscrambling usatio

More anagrams containing the letters U S A T I O N
usatnio usatnoi osuanti aotsnui